Malicious PDF — malware analysis report

Static analysis result for SHA-256 7abd9974f92bc240…

MALICIOUS

PDF

69.0 KB Created: 2021-09-27 23:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 013eaba3427788f470db338a2eeec257 SHA-1: 2c90c018d3d357b45e11f882e45565b38af2f36a SHA-256: 7abd9974f92bc240600490b2767b74f1adf0c1dfb56411f2589a30d188b083ea
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to disposable hosting, a strong indicator of a link farm used for phishing or malware distribution. ClamAV and ML classifiers also flagged this file as malicious. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://smidgel.ru/uplcv?utm_term=how+do+i+facetime+on+android PDF link annotation
    • http://kahasat.cz/data/file/falonewavotunazesoxe.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/wigufubogu.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/lefosonifanevejozoti.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/12203890946.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/64412867602.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/67986355695.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/pezumo.pdfIn PDF document text
    • https://airbays.com/userfiles/file/63858162249.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/lodenisitifosarafiremixiz.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/79511831468.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/81933650753.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/21169656524.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/sulipuwobuzesiterupo.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/mufevuriwira.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/tujajivadovixabofumaj.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/80832306466.pdfIn PDF document text
    • http://grupophi.es/uploads/files/37085364161.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/73297114357.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/91071483031.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/3230839914.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/96062265031.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/wawalaratalapefeditinapo.pdfIn 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://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_off0000ad61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD61 16292 bytes
SHA-256: 106c77606711465a109fb33338fb3051ba75979bbf5c8a68cdf693e15ed7f621
font_01_sfnt_off0000d6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED3 10500 bytes
SHA-256: 3aca384ed8577de548aae473bc2bff948ef199abcb71767fcb698375f12f4849

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