Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e2370d04860d51…

MALICIOUS

PDF

84.5 KB Created: 2021-03-28 13:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92f41c2debd1a094241149205aa742b3 SHA-1: 461b4d66ef1296257a6ec05f8402338597017bfe SHA-256: 71e2370d04860d5135fb8ae3dfa2287f9cf2ed9a87448d3cb17272799320a6a9
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO manipulation tactic. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common method to bypass gateway security. The presence of ClamAV detection and ML classification further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://botokaw.ru/123?utm_term=bootstrap+example+form+input
    • https://cdn-cms.f-static.net/uploads/4475847/normal_60354c4a431d3.pdf
    • http://8gusevshop.space/airtel_speed_very_slow4l03h.pdf
    • https://dopozigixojak.weebly.com/uploads/1/3/4/5/134509916/boxisesepa.pdf
    • https://cdn-cms.f-static.net/uploads/4465949/normal_6036d10e16297.pdf
    • https://mefixakiderix.weebly.com/uploads/1/3/4/3/134319494/7052555.pdf
    • https://fugogifozu.weebly.com/uploads/1/3/4/8/134888696/xekesoke.pdf
    • http://mosquito.codes/autocad_mep_2016_user_guide46vk1.pdf
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/fenesedelo.pdf
    • http://meinekarten.best/981382277345b34l.pdf
    • https://cdn-cms.f-static.net/uploads/4426944/normal_60243140a90a9.pdf
    • https://cdn-cms.f-static.net/uploads/4503524/normal_604ceb0c283e7.pdf
    • https://cdn-cms.f-static.net/uploads/4503390/normal_605c87fe8a772.pdf
    • http://podarokinsta365.site/children_stories_for_church24imx.pdf
    • http://reduslim-shop.website/gym_biceps_workout_chartv0k3p.pdf
    • https://static.s123-cdn-static.com/uploads/4444622/normal_5fcda2d16949e.pdf
    • https://cdn-cms.f-static.net/uploads/4409000/normal_60586841a3c53.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_2415ef8a640f441fb434697fab2914ca.pdf?index=true
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_d8e40fbe2959423c8fc70d253203328c.pdf?index=true
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_f5626bfbaf9045e4a6de93a8718ac0d3.pdf?index=true
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_286412e5f0ec4e79ab934c8df32d9217.pdf?index=true
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_d5ea7520286a4bdd904bb1b7c196b84a.pdf?index=true
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_a5bb9e87fca044f8b53a33e3d47c3005.pdf?index=true
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_8f72622d9dae4282b346e415de165c26.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109f9.bin
53dc592ad4757ff15dd14af1197dd2a8e1eafc8747b611d1c7c124f742de99b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F9 5164 bytes
font_01_sfnt_off00011b7d.bin
5a0f831a5c59e2029334832a118208f27115d60647b5633a82e7d7980c6cb112		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7D 12096 bytes

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