Malicious PDF — malware analysis report

Static analysis result for SHA-256 178efd2b5449a26f…

MALICIOUS

PDF

82.5 KB Created: 2021-04-24 00:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5a40fc415708db3ae4cb2c8020c9449e SHA-1: 6123020217902bed0143ab7eb6e2fb3e3c329e6b SHA-256: 178efd2b5449a26f574e58dd9a5be328e86d803cd03ee16a700c29da22672670
126 Risk Score

Malware Insights

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

This PDF document contains multiple embedded URLs, with one prominent URL leading to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's content, though partially corrupted, appears to be a lure related to software engineering careers, directing users to the malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://mezovuduw.ru/strik?utm_term=how+to+grow+as+a+software+engineer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375889/normal_601cd2d847dfb.pdfIn PDF document text
    • https://degitetebumike.weebly.com/uploads/1/3/1/8/131857056/1972886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409610/normal_60637eb23f9cd.pdfIn PDF document text
    • https://sonikegusu.weebly.com/uploads/1/3/3/9/133997348/fd99ea5f1753.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412897/normal_5ffaa857e3ea7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459929/normal_606a909fb5c61.pdfIn PDF document text
    • https://pobizaxorede.weebly.com/uploads/1/3/2/6/132696020/994038.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489244/normal_601e4f5f5dcac.pdfIn PDF document text
    • https://rotolakudezi.weebly.com/uploads/1/3/4/0/134041133/gevasakomefuk_bemubuve_xofikobedajofa_tonusolozemuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372376/normal_5fc7d459c19f0.pdfIn PDF document text
    • https://fitulepam.weebly.com/uploads/1/3/0/8/130874207/jipivexepobodij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477878/normal_60205724e8606.pdfIn PDF document text
    • https://cdn.sqhk.co/vopufepivipe/jfhgtWy/bufaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422894/normal_60036c27a43fc.pdfIn PDF document text
    • https://cdn.sqhk.co/bezakebijuk/y9dhf27/64972745474.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/hcaFFUl/novelty_toilet_paper_word_of_the_day.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_47d5811988e24873aec987eaf4a4ef08.pdf?index=trueIn PDF document text
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_677df2891317417a8161085e364df6d1.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 4956 bytes
SHA-256: 437db1da19eb2673279c9dd527d7bfa6097d191bb59a453be3c3866f8bf9aca0
font_01_sfnt_off00011704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11704 11300 bytes
SHA-256: 1820e4f7db909de1ad1351442cdca995040f2a587b3bb917a46657e1ba363211

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