Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b9fadeb63ede8b…

MALICIOUS

PDF

67.8 KB Created: 2021-03-21 00:51:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b5a04be759aaf367ee8252485489a26e SHA-1: 5807a8320ed979ea1f23a78418c82ce38b21273b SHA-256: a2b9fadeb63ede8b8b03a5c33523cf90aa50f1f1e0b671e0f62076d0db0aeaa0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The primary URL, 'https://soxebez.ru/123?utm_term=brainpop+cellular+respiration+quiz+answers', is presented as a search result, indicating a deceptive lure. ClamAV and ML classifiers confirm the malicious nature of the PDF, likely as a phishing or malware distribution vehicle.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/123?utm_term=brainpop+cellular+respiration+quiz+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469643/normal_600d2833c1e41.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/6014257.pdfIn PDF document text
    • https://kumobavubisu.weebly.com/uploads/1/3/0/7/130775432/zanujotoze.pdfIn PDF document text
    • https://depemazijibibo.weebly.com/uploads/1/3/4/8/134846300/8284b1a6053f.pdfIn PDF document text
    • https://nimugafibe.weebly.com/uploads/1/3/6/0/136084612/649d9eb3d4.pdfIn PDF document text
    • https://fitatopiwize.weebly.com/uploads/1/3/0/7/130739398/574790.pdfIn PDF document text
    • https://jeputuzomum.weebly.com/uploads/1/3/1/3/131398597/tomivag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389570/normal_604b9374ce58c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472788/normal_5ff196b1483f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_ddf7ab4845ad44f59fe920ed795c1243.pdf?index=trueIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_d856ac2886184f9f97c5b7273753189b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/hp_compaq_8000_elite_sff_pc_drivers.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/umbrella_academy_mask_template.pdfIn PDF document text
    • http://mevukesamuzu.rf.gd/78919416927.pdfIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_dcc3e0c187674603b3b6c44e3dc83320.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/biology_of_belief_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/2000_kawasaki_mule_550_top.pdfIn PDF document text
    • http://lotepilujula.rf.gd/bhakti_yoga_bhagavad_gita.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4F 5244 bytes
SHA-256: 94aac426271c5b23f31d13c056c739dc768c0c47b288d95a90ed7a6d0a95d02b
font_01_sfnt_off0000de50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE50 10364 bytes
SHA-256: 1474bab499eb125cfa58e73b71e25e8dd40266499f8e6c8b25a933013e13dce6

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