Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d4fc860514b061…

MALICIOUS

PDF

82.8 KB Created: 2020-11-23 14:15:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fb7567023c3ef81b48c8f61d5f796c95 SHA-1: b7d645e3ac2be91a1dd1886a9fafe729e7117c98 SHA-256: 18d4fc860514b061b053ae476f43b72c4ebaf6f97067ab79ebd971077212a799
244 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://cctraff.ru/strik?utm_term=Dr+kee+wei+heong+jurong+point In PDF document text
    • https://vesekukoluvili.weebly.com/uploads/1/3/4/7/134759730/bunumas_xikaruraj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413002/normal_5f95c4702762c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420915/normal_5f98fe4ac8a93.pdfIn PDF document text
    • https://zubajabazu.weebly.com/uploads/1/3/4/4/134466761/vidukuvopu_xobawipomufu.pdfIn PDF document text
    • https://ramipataxeki.weebly.com/uploads/1/3/4/4/134483057/8ae1433766.pdfIn PDF document text
    • https://gunesuzupe.weebly.com/uploads/1/3/4/6/134679160/9389877.pdfIn PDF document text
    • https://nimewoguvinu.weebly.com/uploads/1/3/4/4/134433183/1010537.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/laniwibabikesadovasu.pdfIn PDF document text
    • https://xijonezamo.weebly.com/uploads/1/3/1/4/131407630/betireb_kujubib.pdfIn PDF document text
    • https://tiludidiliduw.weebly.com/uploads/1/3/4/3/134385670/6d9466154c794d.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/fawafoxatetuwej_duradozu_jixuxekum_rejejiwonupoxu.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/32bed924-d8e0-4faf-ba95-02635b891f07/86581653498.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/android_studio_project._xml.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/operational_risk_management_dod.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 9492 bytes
SHA-256: 41472284468161ab4bcf1ba3aaab26cf5c6f8f88cbbc6dd66b1cf5d33ebb3f33
font_01_sfnt_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 4892 bytes
SHA-256: 454d864b6211244ac43c5206955727000a3fab8851001c118f3f538aa94cbfc1
font_02_sfnt_off0001168e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168E 11324 bytes
SHA-256: 3ac39331027e635ad25c657fb36b6b0742bb8b8ffc0b8a9a191a712a1b1f0c0d

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