Malicious PDF — malware analysis report

Static analysis result for SHA-256 543418f700bca25e…

MALICIOUS

PDF

70.6 KB Created: 2021-06-11 04:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: de575d9a6c2ff5f85672f7397af71979 SHA-1: 52baf9d1cb27592f6c32b2d139ccab23788a3c7b SHA-256: 543418f700bca25e91217270528eb80462866aadb776eabe431eb78e97789c58
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 0.9997

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://nomylo.ru/pbw?utm_term=sentence+tense+checker PDF link annotation
    • https://gevivefopunuxaf.weebly.com/uploads/1/3/4/3/134331765/e31da99971909b.pdfIn PDF document text
    • https://zunurevupuvofas.weebly.com/uploads/1/3/1/4/131438471/2607771.pdfIn PDF document text
    • https://zokefipevi.weebly.com/uploads/1/3/4/3/134311683/zuxari_kuwuxerineburi.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4414847/normal_60b15aa3bf9ec.pdfIn PDF document text
    • https://jikolugoxolij.weebly.com/uploads/1/3/1/3/131379047/tilapesatomafa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454048/normal_6023fd3734483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388619/normal_60225030d1de3.pdfIn PDF document text
    • https://bejazono.weebly.com/uploads/1/3/5/3/135315558/575050f02c77e.pdfIn PDF document text
    • https://kowedasik.weebly.com/uploads/1/3/1/4/131438617/bdabbe4b89b37.pdfIn PDF document text
    • https://vepovadubit.weebly.com/uploads/1/3/2/6/132696500/kejupowexalop.pdfIn PDF document text
    • https://lobusuzagoti.weebly.com/uploads/1/3/4/4/134470260/86b1ac24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410190/normal_5fe7802abef99.pdfIn PDF document text
    • https://jagewimaw.weebly.com/uploads/1/3/4/0/134012974/rurupilej.pdfIn PDF document text
    • https://notebatamigoxaw.weebly.com/uploads/1/3/4/7/134715817/1181226.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459654/normal_5fd06e20cd710.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcf5e525-9eb7-4889-915d-32adc24914f0/visumadexitozepobamofisot.pdfIn PDF document text
    • http://duvetemeb.pbworks.com/f/61774782339.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0608ab26-3c22-462a-b64f-69bc939d9fa6/basic_physics_force_problems.pdfIn PDF document text
    • http://negaboxa.pbworks.com/f/how_to_change_dymo_label_size_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b6fecb5-9868-4214-bb55-d144234aea85/nufol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e54e6cdc-887b-4393-a575-d85fab51a470/hp_6700_paper_feed_problem.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_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 4812 bytes
SHA-256: 41700688ff22aef0f1ea6b095d36abc153e082096d059e6c29676fe56a6f8a55
font_01_sfnt_off0000e9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C5 10840 bytes
SHA-256: cfc08eed6dffd47e4a170b9af2b58706d6ee4c1ffb11f190a5634092d08100ad