Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c9e50e85c1cbca…

MALICIOUS

PDF

81.7 KB Created: 2021-04-15 00:40:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 88300e29b36423349ed2501d48e80463 SHA-1: 6abb199589c60ae3ce855f20d53a6b7b0859d852 SHA-256: 20c9e50e85c1cbca39261a1ba8ae7ef6265889bc7d3a9e56f6e5953d5a96198a
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high likelihood of this being a phishing or spam distribution document. No scripts were extracted, but the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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/strik?utm_term=life+sentence+diffusion+france PDF link annotation
    • http://jewlgems.com/gukejetaluwatinirogorbcel.pdfIn PDF document text
    • http://lordtrans.ru/baking_soda_vinegar_experiment_worksheetxqpg7.pdfIn PDF document text
    • http://cherrypimp.online/47387125334uchru.pdfIn PDF document text
    • https://cdn.sqhk.co/gajeneset/hjjlbji/89692667627.pdfIn PDF document text
    • http://pollsexpert.com/fasifilazolz36a.pdfIn PDF document text
    • http://differencecheats.net/brown_bear_what_do_you_see_activitiesatm7f.pdfIn PDF document text
    • http://peguxukeziku.sportsontheweb.net/adolescent_health_care_a_practical_guide.pdfIn PDF document text
    • http://pozuvixa.getenjoyment.net/77357073498.pdfIn PDF document text
    • http://airbin.top/75524746282ls2rx.pdfIn PDF document text
    • http://gejulavofanutar.mygamesonline.org/wedifukugederiko.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/how_much_is_a_cochlear_implant_in_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/tirekidifole/jjFggjj/read_along_books_online_free.pdfIn PDF document text
    • http://kmikaerfs.ru/radovozodudabopnipij.pdfIn PDF document text
    • http://donbetosstreettacos.com/what_is_the_purpose_of_argument_mappingfg4xi.pdfIn PDF document text
    • http://verifybadgesbusiness.com/how_to_know_what_glasses_fit_my_facep8huu.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/iOVkjii/19122028300.pdfIn PDF document text
    • http://cabinetsly.xyz/onkyo_tx-nr515_receiver_no_sounddc9e8.pdfIn PDF document text
    • http://fegokodelaxen.scienceontheweb.net/pofenapidiravofowokutilu.pdfIn PDF document text
    • http://wozovumorawoka.sportsontheweb.net/13895006571.pdfIn PDF document text
    • http://fojukivijivik.medianewsonline.com/certificate_of_incorporation_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/guzamuvi/ijv1Xja/jujafarosamivekugubevow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/73793bae-670c-423e-a102-24a20745723e/bitovazoraxiko.pdfIn PDF document text
    • http://matewedidoxeber.onlinewebshop.net/80897996947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c4b4554-a331-43ba-8020-747bffb94340/les_miserables_2012_songs_lyrics.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C7 4804 bytes
SHA-256: dce94851d6d9c359c956be72e1778413bbdabc3a19fa318dda82a09bff8d9884
font_01_sfnt_off00010324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 12440 bytes
SHA-256: fa1267dd8f1535ecfec0aa8e54f87b0952d8c04264372229e9c25f8949aab23f
font_02_sfnt_off00012b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3