Malicious PDF — malware analysis report

Static analysis result for SHA-256 1332481b8adc455b…

MALICIOUS

PDF

67.9 KB Created: 2020-11-13 08:59:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d82e4933d263e90c6e3f1f3a0ba0e218 SHA-1: 1f3c210c6b3e59fa0160a6d28b8c772b8ff97df9 SHA-256: 1332481b8adc455b1bf1d6ee3fc066e6dfb60ffa579214c43705e156c805e5b4
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'traffine.ru'. Additionally, it exhibits a PDF link farm with numerous external links, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffine.ru/123?utm_term=turpentine+and+sugar In PDF document text
    • https://cdn-cms.f-static.net/uploads/4420014/normal_5f96f686b4d7b.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/xatepigijidem.pdfIn PDF document text
    • https://miwilokak.weebly.com/uploads/1/3/4/3/134375457/4193709.pdfIn PDF document text
    • https://mokufomaduw.weebly.com/uploads/1/3/4/6/134600220/3a66439f5b6198.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445754/normal_5fa441c9dc6a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a0452e6-fecf-4446-9271-d3f572d5ccb0/mixodiwebilusowazebi.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/guitar_hero_guitars_ebay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd8048c9-f96c-46bc-bc6f-564f83e74f0d/810924658.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/pengantar_akuntansi_manajemen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd9d3b30-62d6-44a1-9847-d7878fdbb560/20311969000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/673031e7-4e00-4c70-a1b3-6eb8a90e1299/cartoon_network_summer_resort.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93b76d97-7439-4485-b139-28eb989a253a/8611876983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15ac7acb-398e-4312-aa87-8e5b21806f70/75484786290.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_off0000cdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD3 5044 bytes
SHA-256: 4361cbae5ca5d027cafc1d136bf4b9c7067f70ff513da9e5ca9c2f8b4bdf8465
font_01_sfnt_off0000df0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0B 10604 bytes
SHA-256: f85f40f2df021e9eb9db01eae06b6b3c4fd2f43a03fa97a609e6a159ac88dd6f

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