Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab373dca0d4be1d1…

MALICIOUS

PDF

72.2 KB Created: 2021-10-01 00:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: eddaa06274e7b20a42e04ed3a66c5224 SHA-1: 3ef2b24747985354d323f4ab9197d09273369fa4 SHA-256: ab373dca0d4be1d1efcfcfed94ddbdf248a7a637c198290035d4620b8d3d9772
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic identified it as a link farm with numerous distinct hosts, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, point to a pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fixujibuxokifokivoxe.pdf In PDF document text
    • https://rugsinc.in/UserFiles/files/45134665123.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/89619977721.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/koxopipuwoso.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/zavikematuzizonepivuxe.pdfIn PDF document text
    • https://citrasas.com/userfiles/file/16157931936.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/toa9tcsvpa1glp92qeos8r6aoa/godufarobokogosuzu.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/mobezesuvokininibuvovi.pdfIn PDF document text
    • http://shahgrp.com/uploads/49020572589.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/31776360591.pdfIn PDF document text
    • http://shesob.com/file/files/58172201661.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/ferosatavefabizu.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/76113416958.pdfIn PDF document text
    • http://seamacros.com/upload/file/2589835293.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/6699349016.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/bipifebajolevomisamexod.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/67544679651.pdfIn PDF document text
    • https://limsurempat.com/contents/files/biwedagenojow.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/16765917004.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/nazobonaxinenuzefemajenoz.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/16632914397.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a320f2495---42830007866.pdfIn PDF document text
    • http://sciattella.net/images/file/11547559695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=recibir+mas+se%C3%B1al+wifi+androidPDF 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_off0000b533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB533 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4A 11016 bytes
SHA-256: 6d3f0301dd78c1ad403877cc4b41be17cca2c784e4d0e5aa9823d496b06ca089
font_02_sfnt_off0000e6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A6 16736 bytes
SHA-256: b642b57f4c3008a8308b0f9cafc75bb7d9cf3b9f28cc30427504e26e579f83b4

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