Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2bcb5a7a41dd12f…

MALICIOUS

PDF

71.7 KB Created: 2021-09-09 12:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7aa0c43e2ef83b2ecaef6df1bcb46769 SHA-1: 4c109c3e60d47c1c3104538fb4f5e0d2c55c8f2c SHA-256: b2bcb5a7a41dd12fa557b65d42f7d2795952d5a043e744427a40a7050ec321ed
126 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, with a significant heuristic firing indicating it's a link farm on disposable hosting. The primary purpose appears to be directing users to these external links, likely for SEO poisoning or to serve additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hflchw.com/upload/file/67364019456.pdf In PDF document text
    • http://aesg2edcv.handylover.com/upload/files/5873596250.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/56728459908.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/datilafizipofodetexila.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/51876486473.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/lagaxa.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/fezusok.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134c081df10a---51225602518.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/bimokodikedebaji.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/vogunogurazuw.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/66514466788.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/dorisikokugabozuxosipud.pdfIn PDF document text
    • http://prosquash.by/data/favikumujut.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/potisolojiduvejij.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/betan.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/lunujelepixofewebixixe.pdfIn PDF document text
    • http://lex.tj/img/file/wofusovinidofin.pdfIn PDF document text
    • http://trivio.it/userfiles/files/jegawugoziwozop.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/mebafojimaxuruwerir.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/zabunuzukigazitifo.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/rawenebevewiwodudelokede.pdfIn PDF document text
    • https://tarsiman.ee/files/file/xisizigulogofowosif.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139560d5b855---jemuxozukivefebes.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/gegimipowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=game+hacker+rootPDF 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_off0000b872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB872 10216 bytes
SHA-256: dcca25d0ab50f6cbe408c9f163c0511df259a6b8bb03d64a882404582977dac4
font_01_sfnt_off0000cf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF68 16436 bytes
SHA-256: c5e501261279feddeafbb1847329390add617714762acb5c40b8dd0c4775244d
font_02_sfnt_off0000f944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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