Malicious PDF — malware analysis report

Static analysis result for SHA-256 866b09493e28c587…

MALICIOUS

PDF

81.4 KB Created: 2021-04-29 19:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c6f1c11683e84903ec6d8eb9d5a4c06 SHA-1: 15cba592541dcbd29d9956fa66e264cbbe63695a SHA-256: 866b09493e28c58761fea8fe35198e3513c5052b11c08262bba28920ad9c9b19
156 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 are likely part of a link farm designed to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery via the embedded URLs. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://dafemum.ru/strik?utm_term=bissell+proheat+2x+revolution+pet+pro+carpet+cleaner+model+19862
    • http://ukranews.icu/nalobdcede.pdf
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/naxafexe.pdf
    • https://cdn.sqhk.co/sawitofi/ijLoHR5/cute_emojis_for_snapchat_friends.pdf
    • https://cdn.sqhk.co/sozimelizak/ihigjhg/27936911261.pdf
    • http://merishwheelrecords.com/fesajikaxokegugapugepesu0wb0o.pdf
    • https://cdn.sqhk.co/simikimira/gSYXzjc/xebasukotapegufe.pdf
    • https://vowimodinin.weebly.com/uploads/1/3/4/5/134599446/2743054.pdf
    • https://pitiwiju.weebly.com/uploads/1/3/4/6/134687602/9254368.pdf
    • https://mifavawuzizadax.weebly.com/uploads/1/3/5/9/135977912/a0651e09a3fab.pdf
    • https://lowinegegin.weebly.com/uploads/1/3/1/1/131164077/tokusene_ronunipurom.pdf
    • https://biwopotalar.weebly.com/uploads/1/3/1/4/131438783/e6a8dc.pdf
    • https://cdn.sqhk.co/wisaputal/jY5ibRw/free_basketball_games_unblocked.pdf
    • https://duxegebipuvakij.weebly.com/uploads/1/3/4/0/134095857/23505842973.pdf
    • https://cdn.sqhk.co/kubepugemaki/ikQsrzo/57551806016.pdf
    • https://xejukosaxup.weebly.com/uploads/1/3/1/4/131437924/lonegefepefoso_nobira_jogininegit_diwojoranuzo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_f6b11ac0c67f47949426fed7f8f398c3.pdf?index=true
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_0642c98fba7641ca895e2a936e683242.pdf?index=true
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_981c6b1eaa06433892ae5d42c532d42a.pdf?index=true
    • https://bb0106b8-f3e0-414b-a873-a0e24df3f2ad.filesusr.com/ugd/b84a33_1212ad193ec341cebde905d86379c0fb.pdf?index=true
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_13cca002be7b476cb86f951e02f8e508.pdf?index=true
    • https://951e66c5-660f-4748-bfcc-a6cc0831133d.filesusr.com/ugd/4967bb_3c3a941323f04d2cad0026042c028f50.pdf?index=true
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_cc0a5a9e571d42819e238166138da3b5.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_off0000fae9.bin
6bbc0cd173ad40a98fde6866bc5fcb5c4e3603a82656b6b587a4a02f32b7b3ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 6180 bytes
font_01_sfnt_off00010fc4.bin
68616eec9f5c23596ca1d0470d15e63ead046c90051309db46d457a85ee958c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC4 11072 bytes

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