Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1f9ae3f235ad9d…

MALICIOUS

PDF

79.7 KB Created: 2021-03-19 16:12:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: eaeb231c99fdc9a296b766e6bf7e247e SHA-1: 22c2d68c56c890fe46b27b8dd8d46327ab4631a3 SHA-256: 2b1f9ae3f235ad9d771eebad515c2ecc2622032570527622034bfaa18c963c04
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://jottigo.ru/award?keyword=effective+english+communication+skills+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408177/normal_6033878bb7bd1.pdfIn PDF document text
    • https://dumidonawusirug.weebly.com/uploads/1/3/5/3/135306770/3d1cf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485435/normal_603a2ba743f63.pdfIn PDF document text
    • http://maxitis.22web.org/blue_jay_movie_script.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380859/normal_601adede5181e.pdfIn PDF document text
    • https://vowawekalumuz.weebly.com/uploads/1/3/5/3/135304311/4056803.pdfIn PDF document text
    • https://fefodenajefive.weebly.com/uploads/1/3/1/4/131437461/673760c5dac.pdfIn PDF document text
    • https://xisofapetuv.weebly.com/uploads/1/3/4/7/134747578/xiwefave-xatiti.pdfIn PDF document text
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/retarekevada.pdfIn PDF document text
    • https://lexizade.weebly.com/uploads/1/3/4/3/134368494/muwugujizuvoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475392/normal_6051bdb4585a8.pdfIn PDF document text
    • https://kudowelevuk.weebly.com/uploads/1/3/4/5/134585456/73236a4a94a79c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xilekur.epizy.com/how_to_use_propresenter_with_obs.pdfIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_a6aea231a1e74b37be6e953e0f8e79d4.pdf?index=trueIn PDF document text
    • http://wazimeb.rf.gd/jowitowabogipirivopavid.pdfIn PDF document text
    • http://xexokutofopo.rf.gd/ariens_snowblower_dealers_in_wisconsin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a16b795-9dc2-4458-aac8-77356748d585/koxirigiwuvilitotofe.pdfIn PDF document text
    • http://zilomit.epizy.com/microscope_parts_crossword_puzzle_answer_key.pdfIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_33b20503b89d42dbb8a3f016db77eb63.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/08ced1b6-4760-4101-a521-4dd63113e681/15799946952.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_off0000f976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF976 5556 bytes
SHA-256: 1dee76c99d86d4e4536c5787735db928d8714665987087800aec02af7dd6d6b1
font_01_sfnt_off00010c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4A 10964 bytes
SHA-256: 3b09540aa803ac1a89311c3c5b02abc9da1fd15e9b85cebe9cd8a8870f6a5b2a