Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ec77d83a1cf4a1…

MALICIOUS

PDF

77.2 KB Created: 2021-09-30 11:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 30eaf5b123b8c0de26e7bed78658b420 SHA-1: 0fdd2fc496349de00c21a2ef3d6287530643fa58 SHA-256: 08ec77d83a1cf4a16425492c1bc125d9dda834f0c440bdf945eece2515a26921
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it is a phishing lure. The document body is heavily obfuscated, but the presence of embedded URLs and the 'SE_CALLBACK_LURE' heuristic strongly suggest a callback phishing or tech-support scam. No scripts were extracted, but the PDF structure itself likely facilitates the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://bodemveenweiden.nl/bodem-veenweiden-img/pedojanojafusigonixorivib.pdf In PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/20780360385.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/naxulezobazolimarosemo.pdfIn PDF document text
    • http://millecolori.it/images/file/68413281483.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/bagagiwikavaxotifinamas.pdfIn PDF document text
    • http://drironcat.com/images/file/xasabexawox.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/mulinagonedi.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/24432413354.pdfIn PDF document text
    • http://cpils.com/userfiles/file/riruzanizukolewufazi.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/xuxefanolo.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/dumoburelitifezu.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/90505536024.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/de93bc1868ff20a4aafd6f6ed8f90337/67184209856.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/xevod.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/pirutebajanaba.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/17345213387.pdfIn PDF document text
    • http://kco.su/userfiles/file/51428675522.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/rowuvakulavufofawazapi.pdfIn PDF document text
    • http://acelybio.com/upload/files/linubuxitagefajok.pdfIn PDF document text
    • https://equinox-e.com/upload/files/sikepoloxeme.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/4986472614.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/36102149809.pdfIn PDF document text
    • http://7serve.org/userfiles/file/20210922202714.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/3491432809.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/xamozikinuvuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=videoshow+without+watermark+apkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000b430.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB430 16244 bytes
SHA-256: 9229bde5e3614c940ebb387a6affb910e6b09cdb82f6b0ab59768fbd23138caf
font_01_sfnt_off0000ca1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1C 17572 bytes
SHA-256: a9b48c0b54714bd26ac755723c2b20628421be26cf5d8e65a79eb9461685e9cc
font_02_sfnt_off0000f5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 10752 bytes
SHA-256: e0238939cce92e951d6d0ea1f2f1e380a32b720f0b91244ba5db800f78ac31f8
font_03_sfnt_off00010e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1