Malicious PDF — malware analysis report

Static analysis result for SHA-256 3379d860edeb5740…

MALICIOUS

PDF

63.6 KB Created: 2021-01-21 18:08:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 633b51e2e39af0d935660c0e7d055e78 SHA-1: 757e62ac9bc9489fce6989f885492e12a7ad576b SHA-256: 3379d860edeb5740ed20da6a4fc7b01d12c4bfa9e8f6946314eebb36a3a4a3c6
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of many URLs point towards a watering hole or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/123?utm_term=buffer+practice+worksheet PDF link annotation
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/geladupijonime-bebiwato-munenadanifu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454682/normal_5fee87b0afbf4.pdfIn PDF document text
    • https://kinurilidere.weebly.com/uploads/1/3/1/3/131379896/xipovotixasijujazu.pdfIn PDF document text
    • http://memexeti.66ghz.com/savusekoxiwowagifomamadox.pdfIn PDF document text
    • https://cdn.sqhk.co/majatuto/MPIJgho/vmware_workspace_one_intelligent_hub_privacy.pdfIn PDF document text
    • https://cdn.sqhk.co/sepovili/iedqbha/double_arrow_pointing_up_symbol.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/idHgihf/hey_clay_monsters_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460968/normal_5fd79bdfc7077.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453901/normal_5ff0cd226e61d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461773/normal_5fcd0af66263f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dunoziboxisi.epizy.com/circuite_integrate_analogice.pdfIn PDF document text
    • http://wowimes.epizy.com/misifofojegef.pdfIn PDF document text
    • http://siduxosezuk.rf.gd/try_again_jaehyun.pdfIn PDF document text
    • http://kuwoguki.epizy.com/net_speed_test_apkpure.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_off0000bbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDC 5276 bytes
SHA-256: 2614b4b8378fdb24941f16c40e79e3a530d6b9e02ed585f7c0b59d728495cd57
font_01_sfnt_off0000cde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE4 10556 bytes
SHA-256: e5af413fc53f843d05bb3ddc306ed58d001f89aca9cc3b4812421642c7f20aa4

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