Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e56e1b052b167f…

MALICIOUS

PDF

68.1 KB Created: 2021-09-25 22:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dc27d54bab8d126ed352e0397d813a22 SHA-1: 89fa5159b6d05620d889339aa1bbac8f96327dab SHA-256: 73e56e1b052b167f11c0da0b4ff9894dad52b94d36e2be8cdd638b837001db65
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only document with an action trigger, typical of a phishing lure. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a dropper or redirector for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gilupejifedozekekino.pdf In PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/55640345576.pdfIn PDF document text
    • https://22importexport.com/eimages/file/xuluredajodete.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/kagafogumafuwapoket.pdfIn PDF document text
    • http://bscartridge.com/pic/78107300068.pdfIn PDF document text
    • http://asqcert.net/files/files/36881022542.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-11/210911124535204735hng8ywtlhnly.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/n443vttvv3hjgaqu39ch6uq431/zoposanazekedopaketexune.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/55997454456.pdfIn PDF document text
    • http://taigesw.com/upload/files/puwemi.pdfIn PDF document text
    • http://favourtec.com/attachment/file/ganisidobaviv.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/zebokadedobaber.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/19060662521.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210910163124810386.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/nupumijobotife.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/leviveburejo.pdfIn PDF document text
    • http://sungder.com/upload/94469482433.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/zidaloriguj.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/fuvojonuwusinubumepofer.pdfIn PDF document text
    • http://dogable.de/userfiles/file/dumuresegukabit.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/19239366848.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/namiwasususere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=sigma+infinity+calculatorPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000accc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACCC 14328 bytes
SHA-256: f391137650a8c41bdd4a8b04feedf5386996fd45dbac9ad0841debe51e8efeaf
font_01_sfnt_off0000d08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08A 10668 bytes
SHA-256: 42706b23f23e9c414737313a271cab9f82f7fd8f2f122dc712e6cd7735ea1fb6
font_02_sfnt_off0000e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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