Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f2a0b541cae013…

MALICIOUS

PDF

105.6 KB Created: 2021-05-24 11:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ede5935eacd62104ab19bf85d8c773ed SHA-1: dabfdde5c8cfb264c3e08615e4beb150746c6b2c SHA-256: 10f2a0b541cae0137d118d7cb42b83376596ff15f1917fc1734c130cf4bc2e21
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though obfuscated, appears to be a lure related to an answer key, likely to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://golowaki.ru/strik?utm_term=statistical+reasoning+for+everyday+life+answer+key PDF link annotation
    • https://jojimixumomural.weebly.com/uploads/1/3/4/4/134438106/6110740.pdfIn PDF document text
    • https://dexajaxalujum.weebly.com/uploads/1/3/1/8/131857565/24605aa93d12399.pdfIn PDF document text
    • https://kotuvowomikek.weebly.com/uploads/1/3/4/3/134370123/9796451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481424/normal_60546a4de6ff4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392664/normal_601836fc86328.pdfIn PDF document text
    • https://nizomepovunamox.weebly.com/uploads/1/3/4/3/134305669/9220570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477369/normal_60653fd03a620.pdfIn PDF document text
    • https://karezolakep.weebly.com/uploads/1/3/1/3/131398125/zabugu.pdfIn PDF document text
    • https://puraxexi.weebly.com/uploads/1/3/4/7/134718411/825970.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387056/normal_6041cfc56586e.pdfIn PDF document text
    • https://nigipesifagezeb.weebly.com/uploads/1/3/1/4/131411762/31a377c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451736/normal_603089d59a6cc.pdfIn PDF document text
    • https://giloxegikejuzun.weebly.com/uploads/1/3/4/7/134712531/6b40926.pdfIn PDF document text
    • https://wojaginobaxap.weebly.com/uploads/1/3/1/8/131857211/2226168.pdfIn PDF document text
    • https://biposekiz.weebly.com/uploads/1/3/5/3/135349949/dfc1c62.pdfIn PDF document text
    • https://kovirelumen.weebly.com/uploads/1/3/0/8/130873776/mufexelozenolalodede.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/072a3040-1785-4d00-8662-30992ffc6631/farmall_h_carburetor_float_adjustment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f5c8bea-c689-4705-a16a-e1fe32506355/vulidoliwesolebuli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7244515-8e79-41d0-ab73-45e5aa251dab/jasopet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5b52f9b-85b6-4db6-903f-f53da7b0be24/broan_678_replacement_grille.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee82118e-ae00-43bb-a96b-d76a46a7d9eb/11071321874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8186ec74-6030-4c11-84f3-9e08ae160e4c/how_to_join_the_royal_army_medical_corps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c8fd281-5a66-4b74-b5c1-e6b96d59802d/82545313966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b5a4642-acbe-4e34-b097-89ac3d2b80d7/apex_digital_tv_ld4088_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001478a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1478A 5612 bytes
SHA-256: 8e99e927c968c03dd9743c057828876a9a881b6e9a302166fc22e46b08e69f5b
font_01_sfnt_off00015ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ACE 11540 bytes
SHA-256: 681ab9e409cb2879c34cf65c8fc5765fb8b5b4ee75dd7451e2ac16c8dc579378
font_02_sfnt_off00018201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18201 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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