Malicious PDF — malware analysis report

Static analysis result for SHA-256 64772ba5b586e9d6…

MALICIOUS

PDF

77.3 KB Created: 2021-04-02 04:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e4efdf086c57680706e349f5dfe72d3 SHA-1: 77c1bf3bc119003b52520185adc9882d7aec85bd SHA-256: 64772ba5b586e9d6a1afdc4bda7c3f4664b87f7628d5817aed6ea03601e32cf3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious or SEO-spam related content, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it's part of a phishing or spam campaign. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=how+to+exchange+foreign+currency+coins+in+india
    • http://wiinorama.website/blender_2.79_video_editing_tutorialy68ak.pdf
    • https://vinunawamezod.weebly.com/uploads/1/3/1/3/131380031/ad3c900.pdf
    • http://creditscoretracking.info/tecumseh_carburetor_parts_edmontonraavs.pdf
    • https://fekakawe.weebly.com/uploads/1/3/1/4/131437222/wonotaxopafajikaruk.pdf
    • https://xedububedopo.weebly.com/uploads/1/3/0/7/130740082/46a3c578b129.pdf
    • http://fruitnaturs.space/rational_and_irrational_numbers_downloadeqdg3.pdf
    • https://kaferafodi.weebly.com/uploads/1/3/0/7/130775544/gufesabu-resibup.pdf
    • http://zdorovie-vashe-vse.xyz/80338276715iyqml.pdf
    • https://zewobukepefew.weebly.com/uploads/1/3/4/4/134485556/f6d3e7074e.pdf
    • https://duxizesojisuvab.weebly.com/uploads/1/3/5/3/135327590/bezebuna_zumosebavoxowo_manizawaxax_pufuvumegexa.pdf
    • https://xuwudavalibabiv.weebly.com/uploads/1/3/4/3/134321130/ginajularoruxan_vezifufuxa_valix_tunorobono.pdf
    • https://fuviwamirami.weebly.com/uploads/1/3/5/3/135351498/615902.pdf
    • http://verifedform.com/twilight_saga_breaking_dawn_part_2_songs_listagh30.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/runuzitexokol/bunalidagezuguwujiwap.pdf
    • https://s3.amazonaws.com/muvazi/82461702260.pdf
    • https://uploads.strikinglycdn.com/files/bd2d8ca9-7214-4aea-9087-8f39236006f9/wuferotot.pdf
    • https://uploads.strikinglycdn.com/files/2d308321-d772-49c9-8f47-6aff6a30ce0e/gemasolegifomu.pdf
    • https://s3.amazonaws.com/nutanigonu/87785366998.pdf
    • https://uploads.strikinglycdn.com/files/cc77ae03-980f-4a63-bb4c-372bce3881ec/how_much_is_an_eyelash_extension_course.pdf
    • https://uploads.strikinglycdn.com/files/3afa6eaa-0613-43bf-b35a-1c97ccbe152c/les_miserables_soundtrack_album.pdf
    • https://s3.amazonaws.com/jukezeluf/pexusubozukibexufitebuwox.pdf
    • https://s3.amazonaws.com/rejiner/blades_tale_mod_apk.pdf
    • https://s3.amazonaws.com/mojivikapeti/48532281504.pdf
    • https://s3.amazonaws.com/nosepevozux/vikupinaxezut.pdf
    • https://s3.amazonaws.com/gurupixabogivaz/55529738112.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede8.bin
857c739ad1b62c11089d84462d8be39558861d72d2e77182db073a12dd28174c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 5472 bytes
font_01_sfnt_off000100a0.bin
5f996a4a9b060f2362b6897e12f5925301575f5800866a4e339daad42ead9e50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100A0 10844 bytes

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