Malicious PDF — malware analysis report

Static analysis result for SHA-256 4466cb9a3b5134dd…

MALICIOUS

PDF

75.3 KB Created: 2021-03-18 02:32:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f6de134ecf6fd7b7853400c50ac9c76a SHA-1: 15393f146473962e05bdab42b5b16b50cbdf671d SHA-256: 4466cb9a3b5134dd5b8c58688ea7974e390dcb5382ca2b3c25bcf277f1426110
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://yafferge.ru/award?keyword=bearing+failure+pdf In PDF document text
    • http://bijibibisugas.iblogger.org/47412083155.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bbc3cf1-1d18-4884-875a-763dfaefdcde/notuzode.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/42723687247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88bf3e5d-8b9a-403e-96ce-2d5fa94caa20/list_examples_of_object_oriented_database_management_system.pdfIn PDF document text
    • http://xilidufagipap.rf.gd/couch_to_5k_distance.pdfIn PDF document text
    • http://bozawozu.epizy.com/lipupukus.pdfIn PDF document text
    • http://kesabiladid.rf.gd/sandisk_wireless_flash_drive_manual.pdfIn PDF document text
    • http://fowasabitafal.epizy.com/musotosagokitav.pdfIn PDF document text
    • http://favepos.rf.gd/bleuette_diot_gratuit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/042916c4-cbe1-44db-a81d-8d96ed2f39c4/ccna_security_210-260_syllabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1600056a-65bc-4afd-9631-a3c9b233f8df/26778035491.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70563780-0491-42b3-84cb-19da6a5461cf/kefuresapolu.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/counter_strike_1._6_original_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/402d40e1-d3a4-4b0e-ac09-875fbd4ab4f7/new_england_bees.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/513664c0-6de0-4c4e-bf36-4b37b18375a2/71877043260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18ff6485-c769-470f-a5f7-4b87d52a51b1/6313716915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5066456b-96b6-41a7-a978-679c83db17ad/minolta_maxxum_7000_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/178b9d4a-1dfd-42cf-847d-7495d3b0abdb/2010_town_and_country_touring_problems.pdfIn PDF document text
    • http://makitononudovo.epizy.com/bayesian_statistics_for_hackers.pdfIn 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_off0000e97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 5080 bytes
SHA-256: 2d05a3ce1382766119674cdaf509edc05545ca9a2a40ff46dab15529ce86b27c
font_01_sfnt_off0000fadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADB 11164 bytes
SHA-256: 1c6903c1debee3a07409e9db7b5a46ff0822612eacd2573a98a008fa22b665b0

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