Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6aeb602013f72c2…

MALICIOUS

PDF

83.2 KB Created: 2021-03-27 18:51:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 28879d145ca70c5fd39896089f524868 SHA-1: aa02ce224f83cb43568b46e2c3063a4d3847be71 SHA-256: b6aeb602013f72c2c1777e6eee0a8830e08aee18cdbe3f95f4518e746b29ff0d
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm behavior points towards an attack pattern designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://butilitari.weebly.com/uploads/1/3/3/9/133997497/08cbbb51e48a.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371025/normal_602c9e94b1ae6.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/jToo4jU/rocket_race_car_team_umizoomi.pdfIn PDF document text
    • https://cdn.sqhk.co/luxixumogez/gjhgil4/stickman_2_order_empire_hacked.pdfIn PDF document text
    • https://cdn.sqhk.co/supekolev/jhO59Bo/4218589010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392218/normal_5fd1ba579a3fb.pdfIn PDF document text
    • https://cdn.sqhk.co/raxasumo/chcgfQZ/gafikoraraporesajuw.pdfIn PDF document text
    • https://xozojijeb.weebly.com/uploads/1/3/4/4/134436315/nusulazeg_nokus_dumikanewasak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447906/normal_602bdf96dc143.pdfIn PDF document text
    • https://cdn.sqhk.co/bisozowinala/tibghjc/hays_timesheet_app.pdfIn PDF document text
    • https://wosumugip.weebly.com/uploads/1/3/4/8/134867897/muluzusami_woviv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380084/normal_601ef39959bc9.pdfIn PDF document text
    • https://pofekabebo.weebly.com/uploads/1/3/0/7/130739116/zugupofubov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470231/normal_5fcdce2633f78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424645/normal_600d392556094.pdfIn PDF document text
    • https://mofazutozu.weebly.com/uploads/1/3/4/8/134871383/1537823.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/wb/ENAH/~3/bVCGPfG74RQ/wb?keyword=diagrama%20de%20fase%20hierro%20carbono%20pdfPDF link annotation
    • https://s3.amazonaws.com/sizadagazagaj/adverb_exercises_with_answers_for_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/transunion_canada_report.pdfIn PDF document text
    • https://b7c6a474-53ed-4139-af63-4b2f501ae0e7.filesusr.com/ugd/e87294_c02aef1207fb43df85c59f3c499a90cd.pdf?index=trueIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_34a6d5912d00425cb89560214350e920.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/amma_un_marumagal_song_starmusiq.pdfIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_bbd9a577751047f88234c3340ff1142e.pdf?index=trueIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_5ad0229401da406db85b9524a210c620.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_off0001024a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024A 5676 bytes
SHA-256: a38a655d90dfcc078d72b811a3f4b8599b0da7383935525e31e60c78b53e0e93
font_01_sfnt_off00011574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11574 12352 bytes
SHA-256: a36874910d07a1345615671c876f3572ea79c5ef6fc12e9d4e1ae533cfbd49be