Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c629a077f78673…

MALICIOUS

PDF

87.6 KB Created: 2021-03-24 11:52:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69968d6db3e29e3800c3f00645c36f83 SHA-1: 2f2fd223a04b5f8cfdb48b157b0e932b9878ee02 SHA-256: b4c629a077f786731d840a312f393b905dad12d381bd167fdbd96204246db303
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to distribute SEO-optimized PDFs. The primary malicious URL, 'https://xezojetit.ru/strik?utm_term=acer+aspire+e15+service+manual+pdf', suggests a lure related to service manuals to entice users. ClamAV and an ML classifier also flagged this PDF as malicious, specifically as a phishing trojan.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=acer+aspire+e15+service+manual+pdf
    • https://kuwobudub.weebly.com/uploads/1/3/4/5/134587752/govuremin.pdf
    • https://musisemikalig.weebly.com/uploads/1/3/4/6/134694348/3191931.pdf
    • http://trokot-shopnew.online/lovowikepijigokoniterurlemd.pdf
    • https://safamitiwifiro.weebly.com/uploads/1/3/0/7/130739579/lodowe.pdf
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/8034545.pdf
    • https://static.s123-cdn-static.com/uploads/4421336/normal_60037ca4d793c.pdf
    • https://cdn-cms.f-static.net/uploads/4415065/normal_5fdc08aad28e2.pdf
    • http://50offshop.pro/84445282877qcnqe.pdf
    • https://sapobukemofox.weebly.com/uploads/1/3/5/9/135974899/0d0b5e93ee95.pdf
    • https://genaxixa.weebly.com/uploads/1/3/1/4/131437685/a8b43d72.pdf
    • https://najabokaxosol.weebly.com/uploads/1/3/5/3/135300306/79885ae9256d7.pdf
    • https://ginubeputugexow.weebly.com/uploads/1/3/0/7/130738710/2192494.pdf
    • https://cdn-cms.f-static.net/uploads/4472766/normal_60365bf9be22e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7eb43f68-5bed-451d-bd17-b66eec57a6c7/easy_vegan_gluten_free_christmas_cookies.pdf
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_d208a0735fe64a71b19f91f592628577.pdf?index=true
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_cf8e2d190a054195ab13591391c665a8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4bed937d-701a-473c-b4c2-dd288a8f639c/canon_mp160_ink_cartridge.pdf
    • https://3abcc933-4059-444f-8e65-7077e95f005f.filesusr.com/ugd/44645f_f6fff8b7fb5d48d6b32affb84215014d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f24a0b9e-6c39-4e69-b2c7-12aea667aaa8/how_to_set_square_d_pressure_switch.pdf
    • https://uploads.strikinglycdn.com/files/96bcd4f1-b8f3-4192-a85c-79d8484a2e07/bluebook_legal_citation_examples.pdf
    • 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_off000116a6.bin
46d92d09c2485a72f8e7493eaa5d590388d60d72e07999401155f81e10d5bdd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116A6 5528 bytes
font_01_sfnt_off00012974.bin
319800a45d7a7d15978bdf592974f4402dda270d9d8a2ef444e2c7964d7d3351		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12974 11000 bytes

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