Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15287208e52e461…

MALICIOUS

PDF

84.1 KB Created: 2021-03-23 05:50:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f87f9d5e69ff9a3295bef49d4d1efa3 SHA-1: d2f2aa469f0e82eda5e8423fd99adabbda65b1f3 SHA-256: a15287208e52e461acb774b02a29bef1bc29c8246b49fa6797f6f3358efd2ea1
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or redirection mechanism to malicious sites. The document body is heavily obfuscated, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest the intent is to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/123?utm_term=girlfriends+guide+to+divorce+phoebe+jd
    • https://cdn.sqhk.co/vobevufubito/cIgjhgm/boost_free_followers_for_twitch_partner.pdf
    • https://static.s123-cdn-static.com/uploads/4373997/normal_5ff39e0f588f1.pdf
    • https://cdn-cms.f-static.net/uploads/4450048/normal_6047e10a4577c.pdf
    • http://gonifarej.mywebcommunity.org/focusrite_18i20_2nd_gen_vs_3rd_gen.pdf
    • http://jivavesomuviz.getenjoyment.net/76945082752.pdf
    • https://cdn.sqhk.co/pedidagow/gXjehbW/3733155205.pdf
    • https://cdn-cms.f-static.net/uploads/4495385/normal_6057df7ef02da.pdf
    • https://cdn.sqhk.co/nikofejujel/ad8ib0R/13965579895.pdf
    • http://zunololanuxigu.sportsontheweb.net/baxunuzipuregali.pdf
    • https://cdn-cms.f-static.net/uploads/4391907/normal_603d0ff984d16.pdf
    • https://cdn.sqhk.co/kafexobesa/0vhbige/tyrannosaurus_rex_3d_ar.pdf
    • http://gemubanabugawa.mypressonline.com/javofokemudola.pdf
    • https://cdn.sqhk.co/diratukuz/hAl53gj/syfy_shows_on_netflix_2020.pdf
    • https://fotijaxak.weebly.com/uploads/1/3/4/1/134108731/8322323.pdf
    • https://static.s123-cdn-static.com/uploads/4460972/normal_5ff7cc845974a.pdf
    • https://cdn-cms.f-static.net/uploads/4394077/normal_60156b4264b97.pdf
    • https://cdn-cms.f-static.net/uploads/4384640/normal_5fd11b53894c9.pdf
    • https://fuxiwuzepideka.weebly.com/uploads/1/3/1/3/131381491/mazagibepa.pdf
    • https://cdn-cms.f-static.net/uploads/4452206/normal_602afa484027b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lugukejuraxa.rf.gd/ridexituludipi.pdf
    • http://newubopuga.epizy.com/fulebisagoxiwinimofi.pdf
    • http://gofozumi.epizy.com/95503946358.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_off00010ac5.bin
e9db6ffb3b9e9761f2d4aa95ebc2c69b24afb47603403931d603b9f7566f9469		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC5 5516 bytes
font_01_sfnt_off00011d91.bin
a0ab2dbbedcf654c927616ddb1ed2159c457f59770e3903b9d346a28c955f1ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D91 10952 bytes

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