Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7408cea6c8bc59…

MALICIOUS

PDF

75.6 KB Created: 2021-03-19 11:30:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 478de2f451556c4313ed6cb96866be16 SHA-1: 750631a1fbcad5a7d976bd2cdf2de60f2c165a88 SHA-256: 8f7408cea6c8bc59b41f10a9896c91ef5eda65b61daa6ad06ffbf188cf3a326f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO link farms to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF being flagged as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to educational materials, likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/award?keyword=4th+grade+fsa+math+practice+pdf PDF link annotation
    • https://wevapagavum.weebly.com/uploads/1/3/4/3/134306171/be776.pdfIn PDF document text
    • http://teragoronowaki.iblogger.org/37059026898.pdfIn PDF document text
    • https://mekegeno.weebly.com/uploads/1/3/1/8/131856852/jobadope.pdfIn PDF document text
    • http://refoveser.22web.org/tafsir_al_mulk.pdfIn PDF document text
    • https://beveroseve.weebly.com/uploads/1/3/5/3/135316004/jifekajedawilu.pdfIn PDF document text
    • https://fuwipinax.weebly.com/uploads/1/3/4/0/134016709/pogidibepojokena.pdfIn PDF document text
    • http://vovodofozufora.iblogger.org/bojikozelolejovedewo.pdfIn PDF document text
    • http://likefetevu.getenjoyment.net/kagejuwe.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/8292619896.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/puzzle_game_master_answers.pdfIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_eeb2b02775504c4d81326fbcf697e605.pdf?index=trueIn PDF document text
    • http://sofikej.rf.gd/fafikok.pdfIn PDF document text
    • http://pimifemegizak.epizy.com/57435922826.pdfIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_fe2fe90957544ed28ca9357f84ee9878.pdf?index=trueIn PDF document text
    • http://pivimufe.atwebpages.com/wisigiwoguvikudubovisi.pdfIn PDF document text
    • http://lukugebov.rf.gd/layne_norton_fat_loss_forever_download_free.pdfIn PDF document text
    • http://majukukosiw.rf.gd/durefaximed.pdfIn PDF document text
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_63c54038b9e24335b55414576f8c98ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/68307784599.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_off0000e84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 5532 bytes
SHA-256: 3cd5661ca62011c63acb022e0c11850bfd2110b74077f04cb66989cb078c8de3
font_01_sfnt_off0000fafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 10848 bytes
SHA-256: e8c0c70881ad7f175ceb08c90252181d91d5fbcc81849c398c5aabf9368f8fc8

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