Malicious PDF — malware analysis report

Static analysis result for SHA-256 f002e12048cc8102…

MALICIOUS

PDF

77.2 KB Created: 2021-03-06 16:03:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49309955735870b8a89d944342b2f981 SHA-1: 46f61ef331a574ae8090c0aea6c483df918c6047 SHA-256: f002e12048cc8102fc13ac6b50d259f96d923285ba101fa63c148910ad094249
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 PDF files, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this file as malicious, specifically a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/123?utm_term=contemporary+portrait+drawing+artists
    • https://kazugimopizefew.weebly.com/uploads/1/3/1/4/131406381/jorupe-nexaxonuni-kokaluwelojel-gemakopinevu.pdf
    • http://segaruzobuguses.scienceontheweb.net/after_book_3.pdf
    • https://ludurodeb.weebly.com/uploads/1/3/4/8/134852143/batumibupufag.pdf
    • http://labifovejes.mypressonline.com/creative_writing_prompts_for_4th_grade.pdf
    • http://xevusezes.medianewsonline.com/ravefusis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kiremefegonar/b_r_d_o_full_form.pdf
    • https://s3.amazonaws.com/luropi/wuvogulimigukivapedosu.pdf
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_f717480480bf4bebbb1cabd5c3111870.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1f13317f-e54b-41a6-9a83-ed95783e258b/16447552180.pdf
    • https://s3.amazonaws.com/viregujipowuru/where_to_buy_starbucks_cold_cups_bulk.pdf
    • https://uploads.strikinglycdn.com/files/1aeee6af-6a51-420f-980f-202362a25f4f/descargar_driver_hp_photosmart_d110a_para_windows_7_32_bits.pdf
    • https://s3.amazonaws.com/nosepevozux/duvopazefedaji.pdf
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_23246802b08a470a83ab327a6de7abb4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/60bd1ae0-7c68-4d58-9353-860b841921fa/sports_illustrated_swimsuit_models_2020_names.pdf
    • https://uploads.strikinglycdn.com/files/d0cb9b95-2554-4500-afdf-b424a9321826/a_song_of_ice_and_fire_music_download.pdf
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_68e86239adee47d08d264f478654beee.pdf?index=true
    • https://uploads.strikinglycdn.com/files/57be2c5d-23dd-420c-892b-af2eb21d9180/california_real_estate_license_exam_hard.pdf
    • https://s3.amazonaws.com/gewisetug/tabexojemaza.pdf
    • https://uploads.strikinglycdn.com/files/4fc3dd72-647b-4179-b11a-d28ecd49117a/machine_learning_algorithms_simple_example.pdf
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_7bd0f3497879400d9cd9306a3b3aab57.pdf?index=true
    • 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_off0000efc5.bin
a3bd3913645c9e89ab65a502f401324b1f2f13475976bac231cd1655e8fe6f3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 5348 bytes
font_01_sfnt_off000101f2.bin
b99f27dbd771d879811c8985d41e9d4c93489cf5883d60fa441a1f04d49d7cdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101F2 10376 bytes

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