Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd3e7fa196b6335…

MALICIOUS

PDF

71.3 KB Created: 2021-03-17 06:57:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: aa27e4f1ae88be8742c6da47322d9e9e SHA-1: 20b71f830952fec8621e749871c936834a590845 SHA-256: acd3e7fa196b6335a9d2053361ee8e841898405ea8e38a86e9d1c6e162b7f298
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to a domain associated with malicious activity. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=dr+seuss+green+eggs+and+ham+book+read+aloud PDF link annotation
    • https://dulipitigisol.weebly.com/uploads/1/3/4/7/134717891/86297bda.pdfIn PDF document text
    • https://cdn.sqhk.co/rezeribevi/hcjf4hI/warriors_of_fate_sega_saturn_rom.pdfIn PDF document text
    • https://tekuxarutupun.weebly.com/uploads/1/3/0/7/130775258/1387884.pdfIn PDF document text
    • https://cdn.sqhk.co/doporaba/gggjjaD/wezixafiwuxox.pdfIn PDF document text
    • https://cdn.sqhk.co/tireronerogo/nwDox2w/android_os_versions_latest.pdfIn PDF document text
    • https://vafarisitoguv.weebly.com/uploads/1/3/0/8/130874489/c4394ad.pdfIn PDF document text
    • https://lijipowurop.weebly.com/uploads/1/3/4/3/134314174/7200686.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/jgieRhh/19886511064.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisimak/dhdiegh/xizulakigi.pdfIn PDF document text
    • https://sinipipa.weebly.com/uploads/1/3/0/8/130874509/f0ea40233b63.pdfIn PDF document text
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/2132787.pdfIn PDF document text
    • https://mutuvedaluvop.weebly.com/uploads/1/3/1/8/131856278/tedutaxulukasuz_pekonerisarunum_mikevogoliranan_jutopadomumako.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/ibKjghi/89173229136.pdfIn PDF document text
    • http://rodisawikikofu.medianewsonline.com/mi_planta_de_naranja_lima.pdfIn PDF document text
    • http://newuwedeza.mypressonline.com/rozabofunejuvadujatidit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://votixeju.onlinewebshop.net/96256278031.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_off0000da3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3B 5444 bytes
SHA-256: 566ba4994235eceea3dd140e7e10f9881f7ed6471790b1c96290851b26804685
font_01_sfnt_off0000ec95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 10540 bytes
SHA-256: 13498cae4585f0c1fcbe904fe7ecddf7396385e12a26512797f898b20f80c595

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