Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3de830e1f3f5c6…

MALICIOUS

PDF

71.2 KB Created: 2020-12-03 19:16:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: af009333451566ed38ac26271c6c9d5a SHA-1: 10e22b36cfdec94aeb698cb2b4d969a0d7d2bbd3 SHA-256: cf3de830e1f3f5c6d0af16b913dede320c281f9919db6d3760b2c78c1c9e9682
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. It contains a large number of embedded links, many pointing to disposable hosting, suggesting a link farm designed to manipulate search engine results or direct users to malicious sites. The ML classifier and ClamAV also strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/123?utm_term=samsung+sm-t210r+android+update In PDF document text
    • https://zumutunamoja.weebly.com/uploads/1/3/4/5/134588160/4931897.pdfIn PDF document text
    • https://xulajaxosu.weebly.com/uploads/1/3/4/3/134366267/pidegagezelap.pdfIn PDF document text
    • https://sinekagu.weebly.com/uploads/1/3/4/8/134855021/tofiwub_jubuluzafovoz.pdfIn PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/439493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373992/normal_5f898a8820a93.pdfIn PDF document text
    • https://sejusidanixaj.weebly.com/uploads/1/3/4/3/134374441/rumejijesava.pdfIn PDF document text
    • https://jizufozerujit.weebly.com/uploads/1/3/4/3/134343201/bagarolawivemaf-tuxat-zomom-kekowe.pdfIn PDF document text
    • https://zigegawemofeza.weebly.com/uploads/1/3/1/4/131406932/f54fe22f85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369189/normal_5faf4ab032e25.pdfIn PDF document text
    • https://galebekamabe.weebly.com/uploads/1/3/4/3/134305591/vamebavexabap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366662/normal_5f883dfa35fdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481061/normal_5fb2b475c9d71.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/0cedbe48-a230-416d-a5c4-9fd5b0fdd2e9/sekozupevexiwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c12c4a8b-b378-40c8-bd73-95bc9a782c0d/guy_croft_workshop-ksikirja.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/38533637129.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_off0000d5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C8 5708 bytes
SHA-256: 085273b5a9f529a7a5b81c391ea262153f76811ab2ac4db048ffd69101474fd3
font_01_sfnt_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 11388 bytes
SHA-256: 1cf3222ebab695c3d393a1cc2c00adddfca2fc378ddb2ea7e309c3682503855b

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