Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61b5fedd4535ad1…

MALICIOUS

PDF

81.1 KB Created: 2021-05-02 05:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c95ab88cf68bfd2ef34ed1ecbcd733b4 SHA-1: d6ccaad44757db92e8ac934ecceb4525842bca26 SHA-256: d61b5fedd4535ad19ecfc25b342d0a09c3f95cdbf608749b935fa204a3bb269a
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with at least one pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain keywords related to computer hardware, likely as a lure. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites for further exploitation.

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://dafemum.ru/strik?utm_term=dell+optiplex+790+ram+location In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384039/normal_601783356ad30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445104/normal_600fa1c2c0bdd.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/hgqunjj/ripedituwupupoxuwuzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445868/normal_5fd68b7086883.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/d1hhljj/gukojuxixuredovafenu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369922/normal_5ff9757034bed.pdfIn PDF document text
    • https://dituxunejew.weebly.com/uploads/1/3/4/3/134324597/06330e63.pdfIn PDF document text
    • https://menolalosixoj.weebly.com/uploads/1/3/4/7/134714047/2602669.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/xezonijida/baseadapter_in_android_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/fundamentals_of_financial_accounting_4th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/epson_ink_pad_reset_utility_l382.pdfIn PDF document text
    • http://satekivu.rf.gd/77489196897.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/latest_i-_485_inventory_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afa221b9-7480-42f5-8a46-da52b182e8b4/what_is_the_meaning_behind_the_chickens_come_home_to_roost.pdfIn PDF document text
    • http://mefomoximene.rf.gd/70266956895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac9d3adc-7a96-416b-93ec-3b2ffbf31dcf/pinosovibinuxelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ae268c0-d2f0-497a-ba7e-750b7a859e34/how_do_i_reinvent_myself_at_50.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/scrivener_for_windows_8_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/725501a1-83ba-4692-a875-5ea75d987c08/webbs_depth_of_knowledge_levels.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_off0000eabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABE 5348 bytes
SHA-256: 985f1159c15dd283b21cb804e7fa026e3cccebd127c0f98d849976af5cf5b3a1
font_01_sfnt_off0000fceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEB 25896 bytes
SHA-256: b1e219e991e3727a38ebc56da8818b7b92bf3b2806613de553efcdedf1b22952

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