Malicious PDF — malware analysis report

Static analysis result for SHA-256 c418522cf709876c…

MALICIOUS

PDF

65.6 KB Created: 2020-12-04 19:12:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cc332541ed5c2f6e7e624c278e5108f4 SHA-1: f6be9a95dd3a5af7cc27ba18b42f450836be0cd0 SHA-256: c418522cf709876c23a49e62097995c15db7ea69aa36292cd3814508ff07b118
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains a large number of embedded links pointing to external PDF documents hosted on various domains, many of which appear to be disposable or used for SEO manipulation. The presence of a known malicious redirector URL and ClamAV detection strongly suggests malicious intent, likely to distribute further malware or engage in phishing. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ggtraff.ru/123?utm_term=roland+xp+80+service+manual In PDF document text
    • https://tifobavojosimiz.weebly.com/uploads/1/3/4/5/134505066/2504727.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5fa0c8c0b91a3.pdfIn PDF document text
    • https://gigazubexu.weebly.com/uploads/1/3/4/6/134613152/vonogemexo-sipetomonakomu-degelabavo.pdfIn PDF document text
    • https://fanavepuru.weebly.com/uploads/1/3/1/8/131871984/larizudibok.pdfIn PDF document text
    • https://zabemukud.weebly.com/uploads/1/3/4/6/134614305/6007437.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421218/normal_5fbc684e1bcb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375908/normal_5f9437e839f2b.pdfIn PDF document text
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/8fa602dca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450632/normal_5fa1fd04de670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_5f8d84a9ce040.pdfIn PDF document text
    • https://dapujevubo.weebly.com/uploads/1/3/1/4/131438680/jiwov-jigukusatuzanil-lewemewaxobowov-momejo.pdfIn PDF document text
    • https://fafetomipisiso.weebly.com/uploads/1/3/4/6/134603542/688e25f9a6.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/d5b7136b-ffc8-4c73-a87c-8e96457eaa2a/95234823946.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_off0000c40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40C 5692 bytes
SHA-256: 271ef8dbb6731cfdf777c043ffcd911b7429c30405f434f319d05314cf80625e
font_01_sfnt_off0000d75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75D 10180 bytes
SHA-256: 93b2d437bb1a9dca6d053b436f6b75b1448915abc6d6149447f0bb018571914c

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