Malicious PDF — malware analysis report

Static analysis result for SHA-256 d262a42ee88df774…

MALICIOUS

PDF

67.5 KB Created: 2020-11-14 06:26:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a938499e0f028a30244be0b0dde35e85 SHA-1: df875772bc6bb2a7678183307f7037c51a164e5c SHA-256: d262a42ee88df774e7f5ca610be57e6080175841c1a3b9a099a98efb518a53e5
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous external URLs, many hosted on disposable domains like weebly.com, suggesting a phishing or SEO manipulation scheme. The embedded content appears to be corrupted or obfuscated, preventing a deeper analysis of its specific payload.

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
  • 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://trafficel.ru/strik?utm_term=log+horizon+light+novel+epub PDF link annotation
    • https://majizozu.weebly.com/uploads/1/3/4/5/134598595/8b7ad.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/pokobu-pidoror-pekirez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476938/normal_5fae8abab1a30.pdfIn PDF document text
    • https://bibonuben.weebly.com/uploads/1/3/4/5/134576194/1280409.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/labit.pdfIn PDF document text
    • https://dupasaku.weebly.com/uploads/1/3/4/2/134235895/fipitojubilenuw_kakakevubud_rowowe_goxiwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366040/normal_5f8c61dda304f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_5f91e807e20c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406793/normal_5f96344e8909c.pdfIn PDF document text
    • https://gakuwalexutibok.weebly.com/uploads/1/3/4/3/134332976/zagavo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376374/normal_5f9d840bbe773.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f8713d546492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_5f87fcf3acd49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371806/normal_5fa9d66e10f34.pdfIn PDF document text
    • https://jusujonolixutuw.weebly.com/uploads/1/3/1/3/131379247/8209712.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000bf35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF35 3220 bytes
SHA-256: 94815b505d8162ffebe9464f31f7bc0aaf8861870b059d0e62c0995faec0ac41
font_01_sfnt_off0000caa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA1 4884 bytes
SHA-256: 3ec6eeec5393435083e10362b366251f7cbdcc24cf342fb79397fef2d31b3604
font_02_sfnt_off0000db4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4E 11124 bytes
SHA-256: e97a83e4375b17ed34488f183f7db42b4d2dc5a165a241a7e310253932aa6f32

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