Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c54ddc574a7e20…

MALICIOUS

PDF

66.3 KB Created: 2020-12-23 22:49:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecdf295e2d54881696ce55952769c65a SHA-1: 550c5ed7e65ab154bce0f324713fbaa2ebc6d4ef SHA-256: b3c54ddc574a7e20a430168dd0c406d51f183c28812e6dc404a937868ba3a0c6
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged for containing a malicious redirector link and acting as a link farm. The document body is heavily obfuscated, but the presence of numerous external links, many hosted on disposable domains, suggests a phishing or SEO manipulation scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.
  • 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://ggtraff.ru/strik?utm_term=cod+recipes+healthy
    • https://xawupaxov.weebly.com/uploads/1/3/4/6/134699297/9923656.pdf
    • https://nadaxobolimige.weebly.com/uploads/1/3/4/3/134365666/sojuzebodumekut-tonot.pdf
    • https://xotagolopotipik.weebly.com/uploads/1/3/4/7/134713968/6647358.pdf
    • https://weniwekozeg.weebly.com/uploads/1/3/4/0/134012595/4797656.pdf
    • https://cdn.sqhk.co/xibumediw/hbuiihi/wuzijefiwiteboz.pdf
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/puvakizuvugopujex.pdf
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f872fb34ae38.pdf
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/lovovukibejuvomuzagu.pdf
    • https://cdn.sqhk.co/woxemevimox/zichejj/how_to_manage_a_business_bank_account.pdf
    • https://cdn.sqhk.co/sulojumi/iajie58/pigetojoxiwanadabizol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/paxunu/funza_lushaka_bursary_2020_application_form.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_off0000c929.bin
aac34287d0bb76be2dd73a5c27e52f4c0a519f1110e32b3e6829dc71a4c987bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC929 5168 bytes
font_01_sfnt_off0000dab8.bin
56827e19d41f29784cea50d3d5199ab17eef7dbc78d97f0c7d82cf67b9be6324		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 10040 bytes

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