Malicious PDF — malware analysis report

Static analysis result for SHA-256 0109adc41870ad5c…

MALICIOUS

PDF

83.6 KB Created: 2021-04-26 13:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d060d43083651de0951bb926a3c87a78 SHA-1: 81dc6ddc468bda76ffd94825dc48c4f9a939c30d SHA-256: 0109adc41870ad5cd4c7965d411b8054fc149c940591078ad3226f782df68599
206 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. It uses a QR-code lure. 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 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://maypoin.ru/strik?utm_term=briggs+and+stratton+5hp+outboard+motor+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420743/normal_603075117f57f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489054/normal_6063027035f66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450251/normal_601f70855d722.pdfIn PDF document text
    • http://itverys.space/38218529016wk5ju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414678/normal_5ff0a1ed5b116.pdfIn PDF document text
    • http://azorocheat5.xyz/reasoning_question_in_gujaratiyqx3z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444866/normal_5fd6a67001cd6.pdfIn PDF document text
    • http://lighttravel-ng.com/61159350989wnp8a.pdfIn PDF document text
    • http://giocodigital.space/seven_years_old_lyrics_remixmavn8.pdfIn PDF document text
    • http://blognews.top/depunifufozaxefogapatavapwqgx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404108/normal_6012977f6ae18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412899/normal_5fec72fe68906.pdfIn PDF document text
    • http://daating19.site/biomedical_waste_management_2016ujweb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420230/normal_5fd11a7261bdf.pdfIn PDF document text
    • http://bioforcecolumbia.site/physics_solution_class_9_lakhmir_singh_and_manjit_kaur4jb9k.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
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_4ae4f50da48a4e07ac381b17c65954d7.pdf?index=trueIn PDF document text
    • https://033f1a72-e514-447f-b44b-9d234b37386c.filesusr.com/ugd/f05202_543fd64e85624ebea68db1bad21b83a0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/pusunisovagonipidani.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/bitlocker_win_8._1.pdfIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_67b0b6e41bf0447582e7e731206bf9c0.pdf?index=trueIn 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_off0000fc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 5448 bytes
SHA-256: 5153bdcb6d048dace8649b196629b5ca19db4c76118a09a230fe41195b4556a3
font_01_sfnt_off00010e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E99 10672 bytes
SHA-256: 48670de5a7534e40a99d028ca96895543226f42d6f2d17e48a5eb2702a2d1ad4
font_02_sfnt_off000132a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c