Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89a3efb0272ec4c…

MALICIOUS

PDF

88.4 KB Created: 2021-04-06 02:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c12eb221db4fccaefcf2c0579c192de1 SHA-1: f3e9240251f45929296162a6dc3f46a8bdd24742 SHA-256: f89a3efb0272ec4c82c651a631e31a96512e7f99c99cdb255910ed608d3dba8e
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, characteristic of a link farm used to distribute phishing content or malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, suggesting the document is designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/award?keyword=homeopatia+general+pdf PDF link annotation
    • http://zigapajuxijado.mywebcommunity.org/sara_ataxia_outcome_measure.pdfIn PDF document text
    • http://fafuzum.sportsontheweb.net/fipawifemobodo.pdfIn PDF document text
    • https://cdn.sqhk.co/burajugi/wVhaogj/29608593582.pdfIn PDF document text
    • http://pewadulojuba.mypressonline.com/kabevowobu.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/living_air_xl15c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485822/normal_5ff06cfd5a5e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371786/normal_5fe526c978b61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403947/normal_60665d1c91618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424935/normal_605dc1aa169ab.pdfIn PDF document text
    • http://xonejalevesezom.sportsontheweb.net/farsi_to_english_dictionary.pdfIn PDF document text
    • https://cdn.sqhk.co/laripikiwafo/cSijMOW/nosaj.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/jjiJ6eR/93687351634.pdfIn PDF document text
    • https://cdn.sqhk.co/mamozinuba/iieheha/helper_for_brain_it_on_level_33.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/94527942994.pdfIn PDF document text
    • http://wulutano.mywebcommunity.org/functions_of_computer_network.pdfIn PDF document text
    • http://tofoxewesaxizuz.mywebcommunity.org/11565115729.pdfIn PDF document text
    • http://pixujuxe.mypressonline.com/64407850274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371524/normal_602ebcec9b91d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427287/normal_601acae17c3e6.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/f51d4006-f4ad-458d-83b9-d4d35b3844e7/what_to_say_in_a_speech_for_class_president.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/975bcb34-4f27-444d-8acc-e8695fa46115/operaciones_combinadas_con_fracciones_resueltas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fe21fcf-f9c5-40cd-a802-fb4149ac51e0/44942770197.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_off000119b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B2 5144 bytes
SHA-256: cc0facee8972f9a90cb608c8d417d1f978ef8def7b55907210cbed315b33ae3e
font_01_sfnt_off00012b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B19 12296 bytes
SHA-256: 580dcffda378c1d15a5de1163416bf7626cd3418a1be49789c4a5462ceaf867f

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