Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc5c40f9d155e88…

MALICIOUS

PDF

72.0 KB Created: 2021-02-28 09:18:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8a03c721e3a66d02be65f9436bb4f239 SHA-1: 07d25f0ae8d3295a4674ac0582243352b62052c9 SHA-256: 3fc5c40f9d155e885d8944c336ae4d400c76e9c3871f954b41ff577bad83ca31
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting services, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be a cover letter, a common lure for social engineering attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/wix?keyword=warehouse+supervisor+cover+letter+with+no+experience PDF link annotation
    • https://cdn.sqhk.co/delojiwuguj/86achgk/11713288452.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/vorukiroxovaxiradip.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/Mhdhaic/tidajinememevilevewanu.pdfIn PDF document text
    • http://verifybadgehelp.com/la_petite_limousine_fs1765nk6.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/49105731576.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/hbyJahg/pozilutiwenumusesomafige.pdfIn PDF document text
    • https://kifosaxuwaf.weebly.com/uploads/1/3/4/0/134016965/14d9c945199.pdfIn PDF document text
    • http://genoray.pro/zisozurgamm2.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/dJiiDie/sukanufabajuvito.pdfIn PDF document text
    • https://jogelobob.weebly.com/uploads/1/3/5/9/135961552/zuvegik.pdfIn PDF document text
    • https://cdn.sqhk.co/gatutojuse/RP7lCar/guess_the_flag_sporcle.pdfIn PDF document text
    • http://copyrighthelp.info/70106753113zl43a.pdfIn PDF document text
    • https://cdn.sqhk.co/xavaxonad/jcVgjid/30108503126.pdfIn PDF document text
    • http://podarokinsta.site/34562534440azkzf.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/to_the_sky_kingdom_pillow_book.pdfIn PDF document text
    • https://cdn.sqhk.co/doboketuzoj/QYjhi6S/sky_whale_art.pdfIn PDF document text
    • http://khanapoorti.com/magazine_article_title_format0e7b2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rigidafavubo.myartsonline.com/sasekazo.pdfIn PDF document text
    • http://tafiwepamubov.atwebpages.com/evenflo_triumph_lx_vs_symphony_dlx.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE33 5256 bytes
SHA-256: fbdb256950f4ec06bc99ae8607b3209d8b032e728653c47c588ccbbdbedf99ea
font_01_sfnt_off0000f029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF029 10068 bytes
SHA-256: 12b2adf3dc9a1f2d40f1045c2cdd37a0be7ba1dded0058a10d0186c3360ac3cc

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