Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ce74f97a0157b9…

MALICIOUS

PDF

69.9 KB Created: 2021-02-09 11:18:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 096e94407c8db0e796e41dc81cafc2e0 SHA-1: 33cf6ca200e70187b83b6523c6188ca036a9f90e SHA-256: a2ce74f97a0157b904a00fbd1b3aaf5b35273f04afd5b1de94edfe714d95dadc
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites.

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://jacksth.ru/aws?utm_term=captive+portal+login+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495269/normal_6014903fc3bf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473410/normal_600e8c7815576.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421478/normal_5fd0670c38577.pdfIn PDF document text
    • https://zowadite.weebly.com/uploads/1/3/1/3/131380399/wetam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_60176dee9e137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387420/normal_600deb0b72fcf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415518/normal_600402bfd20e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478946/normal_5fc8d5a9baba6.pdfIn PDF document text
    • https://pixadodo.weebly.com/uploads/1/3/2/7/132740612/9989745.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376858/normal_5fe12ab1d9129.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sinalowus.epizy.com/zoxusopunutemenefokukosu.pdfIn PDF document text
    • http://giwolexuki.rf.gd/bokakezigid.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/free_diploma_templates.pdfIn PDF document text
    • http://bikilut.epizy.com/werezoruzaro.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/aquos_sense2_sh-_01l_android9.pdfIn PDF document text
    • https://apkpure.com/captive-portal-login/com.namngao12.luuketnoimangIn 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_off0000c78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78B 4744 bytes
SHA-256: 4fbb78fa1c00bf1fa5e3479bb97fd3ed2c7b261ac62e4b07a9ea6260d1c0b4cf
font_01_sfnt_off0000d7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C5 10716 bytes
SHA-256: 4059b70be50bb1dd4d9f39bdad4fe1f72b937c5f4234a99c933e743be5bc16b4
font_02_sfnt_off0000fc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC81 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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