Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bde2f0036593df4…

MALICIOUS

PDF

82.9 KB Created: 2021-01-26 10:44:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e2070566b96fa362e453cf0a39eff370 SHA-1: 7adde5349b908e0bc8cd4cd8ad4f4908a3eedd3b SHA-256: 6bde2f0036593df4ddad4c774a22255683f413a287c5dc2069283b53395e6ffa
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating it contains a mass external link farm. The presence of multiple external URIs and the 'PDF_SEO_LINK_FARM' heuristic suggest the document's primary purpose is to redirect users to potentially malicious websites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to facilitate these redirects or other malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffnew.ru/123?utm_term=karate+2020+olympics PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379053/normal_5fee091983a79.pdfIn PDF document text
    • https://bejolikide.weebly.com/uploads/1/3/1/4/131437094/gemida.pdfIn PDF document text
    • http://nevoxodaw.66ghz.com/bollywood_movies_mp4_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500438/normal_5ff7792662bbc.pdfIn PDF document text
    • http://visemomasa.66ghz.com/best_garbage_disposal_reviews_consumer_reports.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420013/normal_5fde413af1120.pdfIn PDF document text
    • http://nibatuw.iblogger.org/fujepuboxekizavik.pdfIn PDF document text
    • https://cdn.sqhk.co/filomada/9rOiig4/truck_icon_free_vector.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/kejowatafidakumoguze.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/alfresco_community_edition_5._0.pdfIn PDF document text
    • http://mimegovo.epizy.com/52373803029.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/47992175699.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/62185817439.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/23564243771.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF33 11276 bytes
SHA-256: 9ff9350aca4bfae7b22c8941fa992b137eb2ffb8d8428ae62600e498bd6daa6d
font_01_sfnt_off000104d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D8 5424 bytes
SHA-256: 6ae90ba3eabb900bee63a54215b90853a94e003a5a352f515b48c7c664814a73
font_02_sfnt_off0001173f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173F 11272 bytes
SHA-256: 332bacc7d5510b977bdc15865ed91c53f4eb453a47222d6c235bdd170624ecf6

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