Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c934022f9ec6b63…

MALICIOUS

PDF

70.0 KB Created: 2021-03-15 13:21:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7c133d8bf810a3e6a6d1aa0ba207bb7 SHA-1: 74ce639a28ddef7d5b6c0f1b0ff6cc7f96dd5716 SHA-256: 7c934022f9ec6b630df005bac4dfdd4c88bc76b9c2740dfdf0ebb4d879185e5d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The primary URL observed is https://maypoin.ru/wix?keyword=matsuya+japanese+restaurant+chicago, which likely serves as a lure or redirect. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common technique for malicious PDFs to execute actions or redirect users.

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-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://maypoin.ru/wix?keyword=matsuya+japanese+restaurant+chicago
    • https://limorevoxa.weebly.com/uploads/1/3/4/6/134611026/1e6fa.pdf
    • https://razosuxox.weebly.com/uploads/1/3/4/7/134719946/be46e86735.pdf
    • http://bakuvuwojesefa.iblogger.org/consequences_piano_sheet_music_free.pdf
    • http://lukanovetefitef.22web.org/tigers_quest_book.pdf
    • http://francobusiness.com/dymo_letratag_refills_white_plastic17wyy.pdf
    • http://trafikcezaodebayisi.com/materi_akuntansi_keuangan_lanjutan_1krztd.pdf
    • https://folutiniku.weebly.com/uploads/1/3/1/8/131871586/1959912.pdf
    • https://dezubawutojowi.weebly.com/uploads/1/3/1/3/131398539/1019247.pdf
    • http://vashastrahovka24.ru/pilodexosamexewixipezanewkspe.pdf
    • http://bluebadgeform.com/8851438598040lbz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bofumegudatoxos.rf.gd/15168518842.pdf
    • https://uploads.strikinglycdn.com/files/00924e18-9af4-40d1-98e8-f0b81cb19f4f/organic_chemistry_workbook.pdf
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_21fffc0ff6154e36a26638209f06a468.pdf?index=true
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_343c55daa67d4c93981e823611c1a064.pdf?index=true
    • https://uploads.strikinglycdn.com/files/58d7fb4e-ba12-4696-8c37-10755f12faeb/nadam.pdf
    • https://s3.amazonaws.com/mafavuzenoliki/tuxisixokav.pdf
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_8d7c38b7f98f49518354f83bdea09797.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fbdbbc2d-02e0-4c3c-b81d-70541b37c261/dash_diet_sample_menu_for_weight_loss.pdf
    • https://s3.amazonaws.com/lixisariwulo/55183012685.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_off0000d536.bin
7e6971eb435bf6690efafe30a414ae1c4baadf50a932c17201238a46f29e0fd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD536 5344 bytes
font_01_sfnt_off0000e77c.bin
42bfbef8cff7c982d555676f86c418d0acca06bc963f6dace2af0ad47312718b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE77C 10452 bytes

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