Malicious PDF — malware analysis report

Static analysis result for SHA-256 367c1809e6f820e8…

MALICIOUS

PDF

78.5 KB Created: 2021-05-05 15:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3dd5c7b327e77a5967d250b2fb240e2a SHA-1: 85344662c6aee82c5cd3a10efc58b16375cf4f55 SHA-256: 367c1809e6f820e81bba78ebd5da3df78b66b5819af3241cbdbf0e1d24d55a49
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a trojan. No scripts were extracted, but the presence of external URIs and the document's structure point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/strik?utm_term=acs+voucher+waiting+list PDF link annotation
    • https://cdn.sqhk.co/fakosopalo/aihIgfe/nadojipej.pdfIn PDF document text
    • https://cdn.sqhk.co/gatezoru/chaKnyu/xepijewifodokedisu.pdfIn PDF document text
    • https://cdn.sqhk.co/timafewa/hgBMgdO/wolafeko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_605283fddbda1.pdfIn PDF document text
    • https://cdn.sqhk.co/nizivatitogu/jFFcUha/mezokalofajewawugafereg.pdfIn PDF document text
    • https://cdn.sqhk.co/kupuruvew/jcic8gh/disorganized_capitalism_meaning_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/iigghhR/xesefiwopafeperogebuzix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369141/normal_5fe47e206f5b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389801/normal_602edf2781884.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://79f67b98-100a-41ac-8a2f-4880133f117e.filesusr.com/ugd/f12c90_f2111d47c8134b0da12d64e6dc423df9.pdf?index=trueIn PDF document text
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_02287a5ee4264e46b94b516dd25e2ffe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a741aa94-22d1-4423-8df4-4199ba7e1f90/sixen.pdfIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_8461ce13541746289004ca2dfcaf5ae2.pdf?index=trueIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_2d4c4042818a4787b7b8ffa80696947f.pdf?index=trueIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_30a302df9a2f433a8a35eb6294b9cc4b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff7c983a-5083-4a47-8dfe-02ecf8f1d6ae/how_much_does_it_cost_per_day_to_run_a_dehumidifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5030a6e-1073-4d0a-b72d-e88b2d867ed6/roald_dahl_the_witches_movie_cast.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_off0000f518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 5200 bytes
SHA-256: 1994783165ec9439631f221b4eea634c4a1c1b688179740cfef49ea8e490fc34
font_01_sfnt_off000106dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DC 11356 bytes
SHA-256: 14518a05c1e6db7c5fdcd17cee8bf272eee588979f94fa27bb2eab5d1ef4cb0b

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