Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fcfc445d720fbeb…

MALICIOUS

PDF

74.8 KB Created: 2021-04-04 19:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1389d43d7d7f5abb7a14427256fb291b SHA-1: 1efd3d8035061381d58b4dd814229a57cb445aaf SHA-256: 1fcfc445d720fbeb7ccdf2a16959970878746e9e326769338e57f86e2c3a047b
244 Risk Score

Malware Insights

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

The sample is a PDF containing a large number of embedded URLs, many of which point to link farms and redirectors, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=the+crack+shack+las+vegas+menu+prices In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410027/normal_601280ba44366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393180/normal_600f4faf84094.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477400/normal_5feb0751eb831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488346/normal_6034c40602c84.pdfIn PDF document text
    • http://buganowugam.iblogger.org/managerial_accounting_hilton_9th_edition_solution_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450260/normal_6068d1a7e6dc6.pdfIn PDF document text
    • https://kudowelevuk.weebly.com/uploads/1/3/4/5/134585456/napasusazuvuvikilo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476270/normal_600761cad43ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384036/normal_60414b56e9d0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391620/normal_6009c09c2ba4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473619/normal_60468ec764f86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_606035825d961.pdfIn PDF document text
    • https://turakenedonatup.weebly.com/uploads/1/3/4/6/134610331/bubakajokimusuf_pobuponalag_timibiv_xurus.pdfIn PDF document text
    • http://ribuvesigofozeg.22web.org/nesajonijateralipi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cff07a16-13b2-455b-8a78-148a75b158b4.filesusr.com/ugd/cda0c7_b0225a35312447029ae43d16b2037d31.pdf?index=trueIn PDF document text
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_1452281f47d844ce814886396652a653.pdf?index=trueIn PDF document text
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_9f1674ae385348819bf629369482d738.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/83719803713.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/rixavuwawe.pdfIn PDF document text
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_f300e8e1ae624db89c7a0198ebbe0f2e.pdf?index=trueIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_2d6626a48c794947b90ab6a7618b0386.pdf?index=trueIn PDF document text
    • http://talodidijuxeni.rf.gd/depression_anxiety_stress_scale_test_dass_test.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/vetazavokopo.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_off0000e44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 5420 bytes
SHA-256: fb0c244f3dc353b48369ba66f0c0945f01583cf659da748838ef2afc6128fc03
font_01_sfnt_off0000f69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69A 11696 bytes
SHA-256: 0090105c0767518b6207a081d07301e6781f3829175a11489c43235f288f8d91

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