Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcdce1eca2661791…

MALICIOUS

PDF

83.3 KB Created: 2021-06-07 01:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8a36891ce9d5309d2668553e3c85e5bf SHA-1: 4b98ec7f44552f713e1264f9f1377d3a6f1c3f43 SHA-256: dcdce1eca2661791daedceaa21dd45a0ea6d62fa7ac9b999b47663d80f03ae7c
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URLs pointing to various domains, likely for SEO manipulation or to distribute malicious content. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://archism.ru/pbw?utm_term=how+to+introduce+yourself+to+a+client+for+the+first+time+example PDF link annotation
    • https://wuzafonufiza.weebly.com/uploads/1/3/4/3/134341979/4fe41d56.pdfIn PDF document text
    • https://xixodojele.weebly.com/uploads/1/3/4/3/134375941/tinuzakajogadama.pdfIn PDF document text
    • https://pusakirur.weebly.com/uploads/1/3/4/5/134523180/56dfa20d66b5.pdfIn PDF document text
    • https://vepovadubit.weebly.com/uploads/1/3/2/6/132696500/e9184eb5bbb7.pdfIn PDF document text
    • https://makurabun.weebly.com/uploads/1/3/4/6/134651698/3f2e9153204.pdfIn PDF document text
    • https://relulime.weebly.com/uploads/1/3/4/3/134384492/zaweka-wabukuligo.pdfIn PDF document text
    • https://tifopenowotak.weebly.com/uploads/1/3/4/4/134480635/xixopifaledasuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://disisopaz.pbworks.com/w/file/fetch/144562293/roblox_sword_texture_id_list.pdfIn PDF document text
    • http://wejojixi.pbworks.com/w/file/fetch/144615243/73499484290.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c8e2db5-d31d-4bdc-b8a6-27d6ec879880/are_titanium_drill_bits_better.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2a7f2e9-583b-45ea-941c-b3df6e117544/vujajebevawiture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00761d1e-0a5e-4cb2-9893-a5a9403f4064/gidupolokegabedadawa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbd2cb95-64b6-4406-b866-7e3cb3c88881/how_much_does_drivers_license_renewal_cost_in_oklahoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffd2189c-2e39-406c-8850-e45f8a924ab5/14103394548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d582860-f5d1-4c84-a2ef-a9a164a524b3/kitazuwadov.pdfIn PDF document text
    • http://giribuv.pbworks.com/f/how_to_fix_taylor_food_scale.pdfIn PDF document text
    • http://biwonuv.pbworks.com/w/file/fetch/144467676/chemistry_text_book_for_class_10_federal_board_download.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_off00010841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 5616 bytes
SHA-256: 7273e03de8d11278b53bd8f7a07e8048afe0c95dba23ff5c3157136b5a88571e
font_01_sfnt_off00011b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4F 10708 bytes
SHA-256: a5d625d6026a7e86bb9e17d02bc7f59f93b8bc0b03fe0265acbdd98596fcdc63

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