Malicious PDF — malware analysis report

Static analysis result for SHA-256 097b2afc39d0527c…

MALICIOUS

PDF

79.0 KB Created: 2021-04-07 18:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a564a0f5695185f168a1941eba3a10cf SHA-1: 82d448a515cec977778a12a5978d45ce9c759f9a SHA-256: 097b2afc39d0527c7f19ad3f6f6493fe187dae17d7161020c116600b9bbff4ea
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/123?utm_term=attitudes+to+language+mini+ielts+answer PDF link annotation
    • http://kismyketio.com/fosanaxugudowvpm0.pdfIn PDF document text
    • http://leqqurint.online/zobiwugagelapuzcmvk7.pdfIn PDF document text
    • https://zezupivipikoko.weebly.com/uploads/1/3/4/5/134596705/1f93d097fca.pdfIn PDF document text
    • http://juilopkiretlo.ru/20411012066hf0or.pdfIn PDF document text
    • http://zagufupilafuw.iblogger.org/dpt_3_reporting_requirements.pdfIn PDF document text
    • http://givarixexav.iblogger.org/learn_german_online_free.pdfIn PDF document text
    • https://jeludumekidi.weebly.com/uploads/1/3/2/7/132740852/lulivajenurev-padupojigisak-zoguwijegiv.pdfIn PDF document text
    • http://megantv.site/b_s_f_photo37goe.pdfIn PDF document text
    • http://puditutado.22web.org/34685599650.pdfIn PDF document text
    • http://appletopshop.ru/81964157410bsg2q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421200/normal_60694bc7bea29.pdfIn PDF document text
    • https://tekolukab.weebly.com/uploads/1/3/4/8/134853049/19d7f1c75fa0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416513/normal_5ff255bfb69fd.pdfIn PDF document text
    • https://sizomejuxitiz.weebly.com/uploads/1/3/4/7/134748976/zidokibipi.pdfIn PDF document text
    • https://gozizakodo.weebly.com/uploads/1/3/2/3/132303179/rituvop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gefegasoro.epizy.com/bahubali_2_song_tamil_pagalworld.pdfIn PDF document text
    • http://nidumodosiw.rf.gd/ashampoo_free_portable.pdfIn PDF document text
    • http://devimetoto.epizy.com/pifabowenex.pdfIn PDF document text
    • https://b09d99c6-da67-4e55-b5b3-baceba093817.filesusr.com/ugd/a69c6c_9f3297630421494cae1f15355630145b.pdf?index=trueIn PDF document text
    • http://bejitepirisobi.epizy.com/17414856406.pdfIn PDF document text
    • https://6dd05bf8-a32e-4ce7-8057-9a1894012cff.filesusr.com/ugd/4ce960_e6c8dd37496447d5b1e85d3514d9adfe.pdf?index=trueIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_60b3fcbfd26c474d8002950642abbf87.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_off0000f5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D2 5228 bytes
SHA-256: ce698d309176a28ceead78c7d46d9580e8befef650aebc5b9e09e363de6d4596
font_01_sfnt_off00010790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10790 11040 bytes
SHA-256: cdcb561ce74240957cd770e5dc10ca1968955af4a659211d9c30c6cc984434fd

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