Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d44cb82cfb0a13…

MALICIOUS

PDF

80.0 KB Created: 2021-04-23 13:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6c4628867afb304a2b15d2aa4f700828 SHA-1: 49262f4a5250410a2fe97d6905eb6816f333ff03 SHA-256: 18d44cb82cfb0a1366d7c5aee692129974574e52de0f6bbbe8f638b0a79fc82e
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to external PDFs hosted on disposable domains or known redirectors. Heuristics indicate this is a link farm, likely for SEO manipulation or to distribute further malicious content. ClamAV detection and ML classification further support its malicious nature, suggesting it may exploit vulnerabilities or lead to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/strik?utm_term=crochet+patterns+for+scarves+beginners In PDF document text
    • https://static.s123-cdn-static.com/uploads/4382962/normal_60069ce408d13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454163/normal_60615b52d67ec.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475863/normal_604d6ce913b9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455185/normal_602b54d926d3c.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/gafokogiduwoxatafamorikm8li0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479214/normal_6049527046e9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385012/normal_605f92012aab3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444117/normal_601148c11c8cb.pdfIn PDF document text
    • http://zhk-samolet-krasnodar.info/aleko_gate_opener_installationnaxvp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476595/normal_606771a128a24.pdfIn PDF document text
    • http://cadenalia.com/film_american_pie_8_sub_indogaezz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498882/normal_600d65e09fd80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393506/normal_602e41e7c1b69.pdfIn PDF document text
    • http://constructionhouse.info/12342315930ac5d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kubafezin/grade_4_math_practice_test.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/10514419645.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d530661-b3ea-4cca-a186-06603cbb3876/naweziwuvet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de6778b6-0181-4de6-a6f7-93d3a7380d90/how_to_take_permit_test_online_massachusetts.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_33e636f186f34286a3752af1adce4590.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/88de2f8a-8e4f-44ae-acce-7614a7468e1b/sunbeam_heated_blanket_microplush_10_heat_settings_queen.pdfIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_14104050fd754c339329447a7667f303.pdf?index=trueIn PDF document text
    • https://665985ba-8e9f-4173-b993-17a3090d61d7.filesusr.com/ugd/08421c_ccf9901743664310b98bce32f20d51ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/65343f99-d7f2-4ec2-b32f-3acdd899934e/what_was_the_congressional_reconstruction_plan_after_the_civil_war.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/kindergarten_counting_worksheets_1-_5.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/82236866247.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/algebraic_number_theory_textbook.pdfIn PDF document text
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_40ae387640a74da58a4019aa4d3c2174.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 5348 bytes
SHA-256: ab0616ce03ded0ba9248f73c7c89b71226f4eaba450f03b52e7c557084dd38bc
font_01_sfnt_off00010b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6D 10944 bytes
SHA-256: 3f230991e0cf7072303ab535dbb71edd8d7c13ff7b606757ab871abd2149ff9c

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