Malicious PDF — malware analysis report

Static analysis result for SHA-256 8264bf1ed6e3aa92…

MALICIOUS

PDF

88.3 KB Created: 2021-02-09 07:13:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6fb3f514cd630114bfbe3fefe91d6e17 SHA-1: d0f61822e447cc24352725d6c9fa513b45178391 SHA-256: 8264bf1ed6e3aa92d0dcb0b2435e471ae845d8b06f24870a2518b59eb96c36cd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, one of which is a link farm on disposable hosting, and a heuristic indicates a visual download button lure. The document body, though heavily obfuscated, contains text related to a 'free driver scanner', suggesting a social engineering pretext to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=free++driver+scanner+canoscan+lide+200 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383165/normal_6014744173ca0.pdfIn PDF document text
    • https://menudobuwowewil.weebly.com/uploads/1/3/4/7/134765252/tilene_daxoturu_lager_vixuxidoxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391303/normal_5feea385aee9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420600/normal_5ff2ba62976bc.pdfIn PDF document text
    • http://dabiboniner.22web.org/26403286631.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418556/normal_5ff23b8e12b81.pdfIn PDF document text
    • https://tobosuxonekid.weebly.com/uploads/1/3/4/4/134493818/lagonixofirivoji.pdfIn PDF document text
    • https://kalepadakib.weebly.com/uploads/1/3/1/6/131637037/7021559.pdfIn PDF document text
    • https://zasefupaboz.weebly.com/uploads/1/3/2/3/132302972/328e4af529541.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bubalafugevale.rf.gd/80514313558.pdfIn PDF document text
    • http://jatirud.rf.gd/ronebijozedi.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/17914433942.pdfIn PDF document text
    • http://fuxitajudosev.rf.gd/84179645474.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/wemudeme.pdfIn PDF document text
    • http://javasuk.epizy.com/biranolotesikoza.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/nukevavol.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/tavasosigotulogax.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/gosudalusiwuwow.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/whirlpool_washer_manual_model_wtw5000dw1.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_off00011b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8A 5220 bytes
SHA-256: beb9ff6929330fe4be6887cd66b4ac898525f7b3903419dbcdeb6232144b94a9
font_01_sfnt_off00012d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5F 11260 bytes
SHA-256: a2a01a059d7cbe218dde73be88616fac1c5de66aba0e4f995c7855008bdba6ca

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