Malicious PDF — malware analysis report

Static analysis result for SHA-256 15dfd9f3a7eeb2c1…

MALICIOUS

PDF

68.0 KB Created: 2020-11-14 15:18:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1fb84dcd0c86779ee392187a6b64d753 SHA-1: dfa49d85a67b47ac8f8d0b4978ceddc9693ee207 SHA-256: 15dfd9f3a7eeb2c1a182176402757b702ca59657196ba53f8579cef430c33138
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • 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.
  • 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=mr+tower+wordpress+theme PDF link annotation
    • https://bekijarodik.weebly.com/uploads/1/3/4/6/134617997/negasezufit.pdfIn PDF document text
    • https://nidobafimenute.weebly.com/uploads/1/3/4/5/134526671/xupumoge.pdfIn PDF document text
    • https://zubajabazu.weebly.com/uploads/1/3/4/4/134466761/ruluwifa_defarawebi_sixifo_tugituki.pdfIn PDF document text
    • https://duxixujojive.weebly.com/uploads/1/3/0/7/130739103/2079ec5d29c04f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461201/normal_5fab1828187e7.pdfIn PDF document text
    • https://movidotibapokab.weebly.com/uploads/1/3/4/2/134265591/1d8bedfa1640a.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/ecb3bd7b-d3fe-4893-8ac5-6afcf8b555f6/pukezos.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/22636083755.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/7528406881.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/310c33da-fa59-41ba-a876-a30158746b3a/best_guitar_hero_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dc2a945-5cea-40df-93b2-f970809f0a61/kasamivem.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/53283579404.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_off0000d034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD034 5052 bytes
SHA-256: f7d7485f3a6bcb7e0b7ea03e94584da8965f7881239bf0f0c5afe831b824f2f1
font_01_sfnt_off0000e159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE159 10028 bytes
SHA-256: bfce71cbbeb1732dbb5aab66b85184d78378e4a1205c8f2858a8bb7c7c9493eb

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