Malicious PDF — malware analysis report

Static analysis result for SHA-256 671ee82351496f4a…

MALICIOUS

PDF

72.5 KB Created: 2020-11-25 05:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 302a870f30951ee0ad26865b7e2bb0a0 SHA-1: 431a7ab3abccba075040a0b2e8fd93b02e695e50 SHA-256: 671ee82351496f4ae61cc3a6ebf11e98560afcd87a7870afa8a2d565533a0aa6
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or malicious redirector. The document contains a large number of embedded URLs, many pointing to disposable hosting and redirector services, designed to obscure the ultimate destination. The primary malicious URL identified is https://traffine.ru/123?utm_term=osrs+the+knight%2527s+sword+guide.

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
  • 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.
  • 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://traffine.ru/123?utm_term=osrs+the+knight%2527s+sword+guide In PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/gerisibanifulilezus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_5f8ee98d89fa4.pdfIn PDF document text
    • https://detaliwaka.weebly.com/uploads/1/3/4/3/134340587/dasufusavive.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377101/normal_5fb6c2f43d7de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417123/normal_5fa8664c67bda.pdfIn PDF document text
    • https://vureduvo.weebly.com/uploads/1/3/4/5/134513064/5766585.pdfIn PDF document text
    • https://liwusapewiso.weebly.com/uploads/1/3/4/7/134723342/6969248.pdfIn PDF document text
    • https://kugixixubeleji.weebly.com/uploads/1/3/4/3/134324677/caa3587d9391.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/48695e3d-be5c-4f02-88c9-c6082bc7f662/37878785968.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/7059496184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32d395ac-d6b2-4cba-8113-eaf57aec9de9/rijironila.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/99316694870.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_off0000d301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD301 4944 bytes
SHA-256: c9a8204bf62c38b1fcad12ebb317734c238d537ab047b1bbbab5dd16459ede23
font_01_sfnt_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 10288 bytes
SHA-256: 3f0618264cc907bd73bb37524e454ea66c4583a093db6c616a74442a1ba77076
font_02_sfnt_off000106e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E6 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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