Malicious PDF — malware analysis report

Static analysis result for SHA-256 723a8a462376a81b…

MALICIOUS

PDF

66.3 KB Created: 2020-11-16 13:44:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5a1768846806b32520bef6f47cc57932 SHA-1: 26c5c15d602643e9eb7a1f94ef7604c5882eed44 SHA-256: 723a8a462376a81bb4d1a1a7ece2b159baaac3b4b4c60ffed6354d48dfca4f6f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://trafffi.ru/strik?utm_term=terraria+yoyo+only+guide', is likely part of a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful content.

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 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.
  • 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://trafffi.ru/strik?utm_term=terraria+yoyo+only+guide PDF link annotation
    • https://daxefumusadaja.weebly.com/uploads/1/3/4/7/134763928/d6152326a6199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369664/normal_5fa095c7aafaa.pdfIn PDF document text
    • https://zoseruvabu.weebly.com/uploads/1/3/4/4/134492528/xavuxitofawuve-nuxupadumi-jufoxuge-dukibiruwuluko.pdfIn PDF document text
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/78a5cf14710.pdfIn PDF document text
    • https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/dafba39793d.pdfIn PDF document text
    • https://mejebepagomuda.weebly.com/uploads/1/3/4/4/134494428/lumabubejerewovavo.pdfIn PDF document text
    • https://keruzexutebimoz.weebly.com/uploads/1/3/4/3/134310977/3596ff8d738dc6f.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/noxaliw-pidiga.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/votubukaxogilix/iptv_dvr_software.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/spider_man_game_apunkagames.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/hetalia_cardverse_fanfiction.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/zijarudovetofatanif.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_off0000c6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C7 4868 bytes
SHA-256: 3079047de15a19b9bef339061214f13ec1b90dacf56281a840a166a7e2222f22
font_01_sfnt_off0000d76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76B 10556 bytes
SHA-256: d3308baf5b9e760239cd6a192116f1f306492402acca696d4a6c43a79ec1b340

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