Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c287245e17a627…

MALICIOUS

PDF

72.5 KB Created: 2021-02-19 13:23:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e8d432ed4119cb5cc9a0a2f1cef828fc SHA-1: d7f3efeb39938d218dfdc122fd7af3c344ccf4fb SHA-256: f3c287245e17a62732c113f699680d4bb929167fc47370563efa00817180af06
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains references to "best lawn boy phish" and the authoring application, indicating a deceptive intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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/123?utm_term=best+lawn+boy+phish PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490264/normal_5ff5234dc84c3.pdfIn PDF document text
    • https://xafadefuvabajil.weebly.com/uploads/1/3/0/7/130776308/jewaridipaz.pdfIn PDF document text
    • https://rilumawireg.weebly.com/uploads/1/3/5/9/135981263/2540251.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404308/normal_5ff78f1b2f20b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374376/normal_6002587df163b.pdfIn PDF document text
    • https://kokozorakozuwel.weebly.com/uploads/1/3/0/7/130775651/1705793.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/jdfhfxA/75329151324.pdfIn PDF document text
    • https://jigazukenu.weebly.com/uploads/1/3/5/9/135964778/pizotewisetak_leliginulukap_tozunumojo_rosid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463824/normal_601992af004f0.pdfIn PDF document text
    • https://vufepuxo.weebly.com/uploads/1/3/4/5/134522835/pisiponugovoser-wedowanu-vevijagebu-karanopuv.pdfIn PDF document text
    • https://lejegibovijidup.weebly.com/uploads/1/3/1/4/131438293/kunopig-luzorefigexer-vugabiv-lukafunesiwet.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/ghbibs4/super_jake_s_adventure_download.pdfIn PDF document text
    • https://nematoluzi.weebly.com/uploads/1/3/1/4/131409841/wirunobuto.pdfIn PDF document text
    • http://lubegow.iblogger.org/lutepepez.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 5196 bytes
SHA-256: bc3d58250d7501db35ada87f386e2b607d42e0592397aefd1b4fedb396cc5473
font_01_sfnt_off0000f0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 10736 bytes
SHA-256: b95970150404da9640eec9921ddc278a73ac865f7211a563368f82bb8c1f92b1

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