Malicious PDF — malware analysis report

Static analysis result for SHA-256 132761f3287e301c…

MALICIOUS

PDF

83.5 KB Created: 2021-04-04 18:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84bce391f4035541288ec2a32ccca2f9 SHA-1: 7c1ec9051349beab8733f8a43e49024b5ad99e34 SHA-256: 132761f3287e301c0474add5f104bda2040bcb33d04572ec3226494245025531
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 point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a lure to download further payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://xezojetit.ru/123?utm_term=bruker+d8+discover+manual
    • https://cdn-cms.f-static.net/uploads/4373992/normal_5fe72207cc7a5.pdf
    • https://tekemuwuva.weebly.com/uploads/1/3/0/7/130775778/c921a6ded1.pdf
    • http://onenature.space/xemoborunatimowisozi7sw1b.pdf
    • https://jupolojujilozas.weebly.com/uploads/1/3/4/5/134598947/kowijidajuvorej.pdf
    • https://static.s123-cdn-static.com/uploads/4381101/normal_5ffec19bc0483.pdf
    • http://onlyforyou.space/why_is_annabel_lee_a_romantic_poem3wmoo.pdf
    • http://cetakchantek.com/244804918282zdbj.pdf
    • https://static.s123-cdn-static.com/uploads/4529780/normal_5fc6a3abf27b0.pdf
    • https://cdn-cms.f-static.net/uploads/4368506/normal_6032284c13c35.pdf
    • https://lofefogurabu.weebly.com/uploads/1/3/1/1/131164054/gepapujez_tatuwew_gijamemazuf.pdf
    • https://fabapetabi.weebly.com/uploads/1/3/4/6/134687037/lizilo_moruruni.pdf
    • https://cdn-cms.f-static.net/uploads/4468530/normal_605ccd2e574e0.pdf
    • http://naturalm.space/apple_music_android_won_t_songszvlro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1434dc9c-ad7c-46c3-a384-50c3cbf30ce4/saeco_coffee_machine_canadian_tire.pdf
    • https://uploads.strikinglycdn.com/files/3afda679-5b37-40bd-8b40-6b84df4a332c/quadrafire_wood_stove_replacement_parts.pdf
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_27663aa25a874e599555f96fcc042c61.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bc0c604c-8b65-43e5-8003-ed2a5490f832/foxeriwesuf.pdf
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_06c2c857a37f46c08f92f87851778674.pdf?index=true
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_3e5461dec2ed4f3d87186978adad9d76.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a53dcd4f-1ace-4dbe-afb9-1592a9a7f9cc/thinking_fast_and_slow_audiobook_in_hindi.pdf
    • https://uploads.strikinglycdn.com/files/2aed2357-0148-4953-ab68-401480f8bede/26315519407.pdf
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_9b76bbae400741a58c9f2b467db3face.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0f717ab2-79f1-40d1-b33d-229886847171/vermont_castings_radiance_gas_stove_manual.pdf
    • https://uploads.strikinglycdn.com/files/50440c1c-9e2c-438f-a12d-ff8462fe8664/overlord_light_novel_volume_4_download.pdf
    • https://uploads.strikinglycdn.com/files/1306a4b4-9107-40a7-8e1a-4da8b8b37678/29513462938.pdf
    • https://uploads.strikinglycdn.com/files/16fdb55e-dbac-4062-bbd0-bb6653c34399/topudem.pdf
    • https://uploads.strikinglycdn.com/files/5497fc08-0232-4a5f-bd51-2014e603a486/simmons_sd5k_electronic_drum_kit.pdf
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_b5f727d362b64c61b53756a9ae4a3a8d.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_off000108f2.bin
8f55231caa81124a4486e63cfc001839064fd8a67c7fa2a0f19631fbc3e201bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 5452 bytes
font_01_sfnt_off00011b72.bin
41f902da89a3735a8931c135d751b36ceafd30c087c2b55ee755f426bdee119c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B72 10852 bytes

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