Malicious PDF — malware analysis report

Static analysis result for SHA-256 932e4ab0d102f1ba…

MALICIOUS

PDF

78.0 KB Created: 2021-03-28 17:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5ea740b1cf9f0c082aa23f3e7085d58d SHA-1: c6214c0d8c93654480edfaf00338d1de7932c0c6 SHA-256: 932e4ab0d102f1ba60f99247ffb5bd38edb79758af1b0cd690207f28c484c27e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://baarspo.ru/aws?utm_term=c+programing+tutorial+for+beginners PDF link annotation
    • http://sk-anker.ru/fenijupulabaqzz2o.pdfIn PDF document text
    • http://groby-ritual.online/283231887336rmmo.pdfIn PDF document text
    • https://najijufo.weebly.com/uploads/1/3/4/7/134714833/12ba33b771561a.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/vuvodaxosuwirisa.pdfIn PDF document text
    • http://stav-games.ru/25698155087bkxk2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410448/normal_5fd898b3344ff.pdfIn PDF document text
    • http://fixmarker.fun/viridian_arlington_hoa_feesve3l1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454824/normal_601c6a9ae8fb7.pdfIn PDF document text
    • http://dobofozepop.mygamesonline.org/charlie_brown_christmas_music.pdfIn PDF document text
    • http://gdztut.com/27253351717j5ogm.pdfIn PDF document text
    • https://medogizelolu.weebly.com/uploads/1/3/1/0/131070938/7042037.pdfIn PDF document text
    • http://mavaxur.mywebcommunity.org/vasimaxo.pdfIn PDF document text
    • http://fegiroxopirez.sportsontheweb.net/sap_capacity_planning.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
    • http://zatuvejamubolo.atwebpages.com/75565792078.pdfIn PDF document text
    • http://jatoxat.atwebpages.com/the_economist_7_july_2020_download.pdfIn PDF document text
    • https://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_558d6fc1036e43a8a6a77f1f7c1c1a78.pdf?index=trueIn PDF document text
    • https://c948e902-2437-43f3-9f1e-7aaad30688a7.filesusr.com/ugd/464a75_ae95a6431a7e4804a162a6b414bd53c5.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_off0000e632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE632 5268 bytes
SHA-256: 49ceda1de04417ef97ef93f1a0c4b1ca88090310c54bac21df96a8c52e58a5de
font_01_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 10780 bytes
SHA-256: 188e0492b076258b90f661d6a15cfcfb218423aba37f23fbb6e9262149d595a0
font_02_sfnt_off00011c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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