Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0d6aabcd885487…

MALICIOUS

PDF

81.5 KB Created: 2021-04-08 01:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d278d9932778d2a886b0468389c9e10e SHA-1: d0c0eb7cb489ae19709fc33eb104ce484a8aa5f6 SHA-256: bc0d6aabcd88548726b080fd9f4a65a2c96d203851f2a18a4894c8f2fdd9cb71
164 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, with one heuristic specifically identifying a 'PDF link farm'. The document body, though heavily obfuscated, suggests a lure related to a 'manual'. The presence of external URIs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to malicious sites or download further malware. The ClamAV detection further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://jacksth.ru/wix?keyword=tc+electronic+quintessence+manual
    • https://vudolizozirotor.weebly.com/uploads/1/3/2/8/132815306/falexumoku.pdf
    • https://cdn-cms.f-static.net/uploads/4481852/normal_601bd0cac6cda.pdf
    • https://cdn-cms.f-static.net/uploads/4412415/normal_604496b621c35.pdf
    • https://cdn-cms.f-static.net/uploads/4456676/normal_606b398e97bac.pdf
    • https://static.s123-cdn-static.com/uploads/4491450/normal_5fe33c205bddd.pdf
    • https://static.s123-cdn-static.com/uploads/4405674/normal_5febea9618268.pdf
    • https://cdn-cms.f-static.net/uploads/4371025/normal_600c1dd284f86.pdf
    • https://cdn-cms.f-static.net/uploads/4483610/normal_601e659651b0b.pdf
    • https://cdn-cms.f-static.net/uploads/4366343/normal_6052ff689fd57.pdf
    • https://ripegedabezigiz.weebly.com/uploads/1/3/2/6/132695689/9a1ffb7c4b.pdf
    • https://xorapuwo.weebly.com/uploads/1/3/0/8/130873927/8032245.pdf
    • https://jaxifojuw.weebly.com/uploads/1/3/5/3/135351184/dcb832c1094f.pdf
    • https://cdn-cms.f-static.net/uploads/4475216/normal_6049c5fdd92f9.pdf
    • https://mulaxenowaw.weebly.com/uploads/1/3/4/8/134862071/tuzokoxovevof-befapipusasof-nalixunefijije.pdf
    • https://cdn-cms.f-static.net/uploads/4465709/normal_6058c2d2b0792.pdf
    • https://fimupekegu.weebly.com/uploads/1/3/4/5/134502303/jalovovafaxif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9f0639d5-f744-4953-aa26-95aad6059b2e/computer_hardware_engineer_jobs_in_chennai.pdf
    • https://uploads.strikinglycdn.com/files/0cea39c5-b291-42b0-af08-b8b880a41ed5/leroli.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102e4.bin
7d9fb59fa7028225f3a811bef2c5c4c867e8e682157416b8a8580dd1f8aae5a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102E4 5020 bytes
font_01_sfnt_off000113df.bin
b08fe828a49368f0441cb0b23b47ab4e11be4a66837fc59e8291fb492feabc1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113DF 10876 bytes

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