Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb4880c9ae12dba…

MALICIOUS

PDF

70.4 KB Created: 2021-04-07 21:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 86da59213f6d88e52dec36a53a09fde9 SHA-1: b621c271d294ac0ca39b67162d8c449e0b9e6cf4 SHA-256: 2bb4880c9ae12dba1660a75f564e9abe018fbbe2389349d7d4167785dd43c27b
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to a textbook solution manual, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jumiwimov.ru/strik?utm_term=algebra+lineal+grossman+7+solucionario PDF link annotation
    • https://cdn.sqhk.co/fasegibuniz/0hdvgen/wetigiv.pdfIn PDF document text
    • http://norelowugazilu.22web.org/oxford_maths_book_for_class_6_solutions_free_download.pdfIn PDF document text
    • http://memakumiri.iblogger.org/73620684369.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/id4ijhi/queen_greatest_hits_iii_songs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nowaginog.epizy.com/47437582504.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/66662804727.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/bemujokosegotok.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/lizizasom.pdfIn PDF document text
    • http://ruxofepugoloma.rf.gd/36092655802.pdfIn PDF document text
    • https://b9387e75-0942-48a6-8a47-0bd3f0224277.filesusr.com/ugd/fc485c_46ae874d602e4e6a9241de675381cfd5.pdf?index=trueIn PDF document text
    • http://ditufadupogeju.epizy.com/55988012226.pdfIn PDF document text
    • http://nuruvowaj.rf.gd/hallelujah_sheet_piano.pdfIn PDF document text
    • http://fojigexojapox.rf.gd/46803537656.pdfIn PDF document text
    • http://vetisuduxujin.epizy.com/pdf_bestand_kleiner_maken_mac.pdfIn PDF document text
    • http://wekapalipewux.epizy.com/microsoft_access_2020_tutorial_free_download.pdfIn PDF document text
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_9179b7a362b4494aa908a14522d30918.pdf?index=trueIn PDF document text
    • https://8fc58a2e-a183-4186-a39c-c7ccdc1e23d5.filesusr.com/ugd/a298ce_ed25da09a3354c2a9340a2e2858f8607.pdf?index=trueIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_7611dc1636a24b79b1bc5953e1ad0d02.pdf?index=trueIn PDF document text
    • https://528a8416-53f4-4693-bcf0-540471887af1.filesusr.com/ugd/c3aa89_a4e2a563c92c4ce383bdf6afb5d5e38a.pdf?index=trueIn 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_off0000d5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BE 5328 bytes
SHA-256: 667835aeef784800b95095797db143c0980d7f3b8b32184f2e538d0feb40e0f2
font_01_sfnt_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 10984 bytes
SHA-256: ae1be5103a20ff654856e06d68acb43c5deb38052ddc029fff803c6656fed669

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