Malicious PDF — malware analysis report

Static analysis result for SHA-256 5418e771b48c4dab…

MALICIOUS

PDF

73.7 KB Created: 2021-03-26 04:18:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 013601e4116d04a1eaf6f1c2182afd9b SHA-1: 5f93c0354fadafbbdbe5a90210557d8841158c94 SHA-256: 5418e771b48c4dabd587305666a86b640d27133431c1d2169d52e8fce380b7eb
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or lead to phishing sites. The heuristic firings indicate this PDF is part of a link farm and is flagged as malicious by ML classifiers and ClamAV. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest the document's primary purpose is to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ponafet.ru/award?keyword=adobe+pdf+converter+online+free PDF link annotation
    • https://bilokomomaxin.weebly.com/uploads/1/3/5/3/135397692/1664217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505326/normal_604cd3dd1fbb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452398/normal_6037d60a047d8.pdfIn PDF document text
    • https://cdn.sqhk.co/xonudutixova/fgdySgf/internship_request_letter_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366309/normal_5ff5d24643e2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379222/normal_5fc7c5d7485ba.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/gdIktgd/alien_warfare_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/vedisaso/ZEwgihi/buzzer_app_for_quiz.pdfIn PDF document text
    • https://ruzasamevu.weebly.com/uploads/1/3/4/5/134591323/7730489.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469641/normal_603d3217153a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446490/normal_5fdc083c0bf8c.pdfIn PDF document text
    • https://lenopeseku.weebly.com/uploads/1/3/4/0/134040497/wuzit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407087/normal_602411f17f4e1.pdfIn PDF document text
    • https://koterevimudo.weebly.com/uploads/1/3/4/3/134342185/jizivubavutep_rojeluxi_sinovazazemit.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/Rx1g0ja/7_wonders_of_the_world_2019_official.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445104/normal_6057ae425a9dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471081/normal_5fe17bbe6760a.pdfIn PDF document text
    • https://wafifeberir.weebly.com/uploads/1/3/2/6/132682897/damatipotuj_nukef_mogagubas_meguwukebived.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455884/normal_601e4f60e1d41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481820/normal_5fcb33f51e050.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/iia5Cha/mobile_screen_recorder.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_06342260cdb64e93862e0a835fdcd89c.pdf?index=trueIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_8e5689493b3e4cd2888961088da1e592.pdf?index=trueIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_d415fc8cb2d4421ab7aed02da7033ff0.pdf?index=trueIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_8197d4f186ef4909bf3ceee84cdfe140.pdf?index=trueIn PDF document text
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_6231907e22f0462e8b071cc4992828d6.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_off0000e3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3ED 4952 bytes
SHA-256: 29bcc6428d92065c4ceab070f9d0070b2f80deb7af0d1bde01195c0a65690f07
font_01_sfnt_off0000f4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 10584 bytes
SHA-256: 9b1b8abc493a09f459bdc72312231a362397b8bc7a2bae599a6bac23ce45d118

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