Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f84941f4d4d4af…

MALICIOUS

PDF

79.6 KB Created: 2021-05-10 06:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f96db7f5ec48b0ca37cd09d78b566a9 SHA-1: 2919128f98ca6cc4c2b9b193202b4cf03bbe9f3c SHA-256: f6f84941f4d4d4affdb1d961e2d8d2fdf4ec6c6811deabe6e09cb6818b7bef13
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL being https://xezojetit.ru/strik. This heuristic, combined with ClamAV detection and ML classification, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=garmin+nuvi+2595+power+cable
    • http://videohost.space/553449945138bj2y.pdf
    • https://tiwilofudux.weebly.com/uploads/1/3/1/6/131606348/tugudugox.pdf
    • https://mevemedetu.weebly.com/uploads/1/3/1/8/131871578/07be53.pdf
    • https://zirilomeme.weebly.com/uploads/1/3/6/0/136025267/vodufiwotipuwoviru.pdf
    • http://xrootunited.com/have_got_exercises_5_primariasvgdq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b9387e75-0942-48a6-8a47-0bd3f0224277.filesusr.com/ugd/fc485c_d735b0af5a1347b0b50cb4144904d0e3.pdf?index=true
    • https://s3.amazonaws.com/fakuguvil/amritsar_golden_temple_images.pdf
    • https://s3.amazonaws.com/banula/89429216866.pdf
    • https://s3.amazonaws.com/zodawanuror/suveporesixufurebidose.pdf
    • https://uploads.strikinglycdn.com/files/e58878a7-64a2-43f2-a396-df0d11f504e5/explosive_calisthenics.pdf
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_e595d4aa0b754e52b22bb20feac96cff.pdf?index=true
    • https://s3.amazonaws.com/ponivotigegepub/8265184787.pdf
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_9338ffecce654c83949a7df4468c94c1.pdf?index=true
    • https://s3.amazonaws.com/kotenu/14203403794.pdf
    • https://s3.amazonaws.com/topipovikapari/fekonowebeziz.pdf
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_5a2860649d5a4aea8dde79f31f457cfc.pdf?index=true
    • https://s3.amazonaws.com/lebaxa/44358484716.pdf
    • https://uploads.strikinglycdn.com/files/92c242bf-4134-4a5a-9b85-9a02f4fe6850/how_to_analyze_data_in_quantitative_research.pdf
    • https://s3.amazonaws.com/jamuluvuvava/1st_to_18th_birthday_memory_book_personalised.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_off0000f6c9.bin
1db9afd0a42b74b61a91f5a72bb0a38c9ec7cb23329eb19286b62eb1b310b59b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C9 5636 bytes
font_01_sfnt_off000109f6.bin
50772dca53dadc3d0304388c5a315934182fbe77a793ce8ac960649c94252b78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F6 11096 bytes

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