Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf90a2f5ceedfc1c…

MALICIOUS

PDF

90.7 KB Created: 2021-03-14 04:46:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 29700e16678447e94f6a9556840a184b SHA-1: 172697a132575734264ca0402746cfb48405e02d SHA-256: bf90a2f5ceedfc1ca3193bd54a13c3227d76ec30767e53315473cf436426532b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, with a prominent one leading to 'pelibifir.ru' which is likely part of a phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for malicious links, further supporting the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/strik?utm_term=honeywell+advanced+quietset+5+review PDF link annotation
    • http://thedefenseforge.com/zavurewefizi9w8tz.pdfIn PDF document text
    • https://cdn.sqhk.co/xisiwuba/gLQjbjh/16892100090.pdfIn PDF document text
    • http://frankkyko.com/99782380678ofjog.pdfIn PDF document text
    • https://cdn.sqhk.co/fabavukunatu/AhehdPT/toolbox_talk_topics_construction.pdfIn PDF document text
    • http://g2am2e.xyz/pefewob18ks.pdfIn PDF document text
    • http://gezinuloxi.22web.org/96385716007.pdfIn PDF document text
    • http://mudelukise.iblogger.org/6305825970.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxiteparam/icifJJP/junopevil.pdfIn PDF document text
    • http://boevoenlp.com/7289748317pwfbg.pdfIn PDF document text
    • http://bottlechainworld.com/can_be_used_to_communicate_with_satellites_brainly3o5hd.pdfIn PDF document text
    • https://cdn.sqhk.co/wikaraxixi/ghfpY51/25101849006.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/8e208f4a-ef33-4ff2-88cb-a3f762eff3bf/mebijojajawar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5b1712b-2535-40fd-8936-8b4a3e53c6e4/gewipanolofirajew.pdfIn PDF document text
    • https://d5f1d3db-1598-48d0-a061-764c190a6564.filesusr.com/ugd/866690_f0700aab88284154af8a35e2814955c9.pdf?index=trueIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_57917f84796344bf968127d8a83270b5.pdf?index=trueIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_1ed6a88a09774e20ab0a9c2a9c3ec40a.pdf?index=trueIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_e44bfc8c57fa432299dc8f2b572c6a97.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9af1089-f864-4b5d-b233-ab9063d3897f/43237046522.pdfIn PDF document text
    • http://milojomalodomu.epizy.com/zapuxidilokuwafawifeto.pdfIn PDF document text
    • http://jopewadakos.epizy.com/pumulovekofu.pdfIn PDF document text
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_c33b9a83e41d415fad47e5d5647396b9.pdf?index=trueIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_285654eb2c0e420db39314e9c6506e0f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/20c866fe-4717-4990-889e-7c6d0c36b64a/vidivarovimogigigukosopi.pdfIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_e3539c2b3e9f4d0790d1b9b7b2728141.pdf?index=trueIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_1e511879e1fe4b419ec7868ac3dd3daa.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_off00011f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F46 5396 bytes
SHA-256: 559d6596371609428644afe80dd9371a095c6fbfcde85ee3419001e40333beb5
font_01_sfnt_off000131ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CE 12800 bytes
SHA-256: 76be756141ebbea438e76c4d2174eb93add988ad42f50c742b478d4ffe47a1a9

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