Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bdd0316bbb3d96c…

MALICIOUS

PDF

76.7 KB Created: 2021-04-23 17:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2264eed3cd3575b3389af3212de48fdc SHA-1: 77ce759478b3b88b24de2eaa4b090234f83f9336 SHA-256: 3bdd0316bbb3d96c631a0c2f5dc04443d5ad109a93232ede52ab5088ab1a1980
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs indicate an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=is+the+valentine+one+the+best+radar+detector
    • http://1xbet-registr.site/raguneferutexj55vl.pdf
    • https://fevawitag.weebly.com/uploads/1/3/2/6/132695646/disomuvewewonali.pdf
    • https://static.s123-cdn-static.com/uploads/4404293/normal_5ffd3122769d0.pdf
    • https://jasasexu.weebly.com/uploads/1/3/1/1/131163864/taxujodonit.pdf
    • https://cdn-cms.f-static.net/uploads/4367631/normal_6031ce4db00a6.pdf
    • http://byseles.xyz/pygmy_hedgehog_care_sheetx3vae.pdf
    • https://mitivowa.weebly.com/uploads/1/3/1/6/131607237/0a1dc9cbcf43.pdf
    • https://jaxedafotonomut.weebly.com/uploads/1/3/4/8/134885779/ganoxit.pdf
    • https://static.s123-cdn-static.com/uploads/4417418/normal_5fde4b392ca48.pdf
    • http://tiluvopira.medianewsonline.com/10532868706.pdf
    • https://cdn-cms.f-static.net/uploads/4408583/normal_604cb952ca9f6.pdf
    • https://static.s123-cdn-static.com/uploads/4453335/normal_5ff48ff08a4e3.pdf
    • https://cdn-cms.f-static.net/uploads/4403264/normal_600fd5d97379f.pdf
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/1807062.pdf
    • https://witatubaf.weebly.com/uploads/1/3/1/6/131606367/rifuxona.pdf
    • http://4escam-bot.online/zakupepuluxikebakuxiginm4ff6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://litabasiker.onlinewebshop.net/retencion_placentaria_en_animales.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed20.bin
185a28562936556120123822d33d965cac224611f415acebf5f409a3056696e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xED20 5164 bytes
font_01_sfnt_off0000fea7.bin
e6146a3916cbf843a286eaa2269c64d1d2ea61dc2da47b61fba98c310b1f9463
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA7 10976 bytes