Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96adae66a82b53e…

MALICIOUS

PDF

81.1 KB Created: 2021-03-02 23:48:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 32b8a7b142865427f8a36a14fc78a160 SHA-1: 503fe40375d5ab7a8e04558697bbedb08c50c810 SHA-256: b96adae66a82b53e89b77f32c73c7679ffea3817e8ba2db1878b33e6c2cabd78
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm designed to redirect users. The embedded URLs, such as 'https://mezovuduw.ru/strik?utm_term=can+i+use+my+phone+as+samsung+tv+remote', suggest a phishing or malware distribution attempt by masquerading as search results. The PDF structure and numerous external links point towards a tactic to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=can+i+use+my+phone+as+samsung+tv+remote PDF link annotation
    • https://sewatebemadog.weebly.com/uploads/1/3/1/1/131164437/dea3f66a8.pdfIn PDF document text
    • http://bosuloridulumo.22web.org/28768451564.pdfIn PDF document text
    • https://cdn.sqhk.co/pegidago/7ayMPgj/police_car_racers_vs_cops.pdfIn PDF document text
    • http://top-salez.site/econometrics_final_exam_questions_and_answersuoce6.pdfIn PDF document text
    • http://hamsterbig.com/97257422349sl48v.pdfIn PDF document text
    • http://nout-sale.site/why_we_cant_wait_audiobookao54q.pdfIn PDF document text
    • http://tacfitproducts.com/6699753489578gn1.pdfIn PDF document text
    • https://topigofifudonif.weebly.com/uploads/1/3/5/3/135304546/b9c508f26c269e7.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/cSmd131/high_speed_chase_today_nj.pdfIn PDF document text
    • https://cdn.sqhk.co/tupujokuz/TRsfihM/dadite.pdfIn PDF document text
    • https://cdn.sqhk.co/begokaxawip/iTidakw/fugobosiwigikafa.pdfIn PDF document text
    • http://50offstore.info/ameloblastoma_plexiformewosoz.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/4234716.pdfIn PDF document text
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/581229.pdfIn PDF document text
    • https://cdn.sqhk.co/gototovubuwi/HchdMpk/awesome_pocket_rocket_piggy_bank.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mudivakerimenog.epizy.com/free_email_bridal_shower_invitation_templates.pdfIn PDF document text
    • http://zixaxonenugoko.epizy.com/noida_metro_admit_card_2019.pdfIn PDF document text
    • http://dubured.rf.gd/element_55_inch_tv_weight.pdfIn PDF document text
    • http://tigodovujoxam.rf.gd/google_maps_my_maps_ipad.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_off0001002a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002A 5268 bytes
SHA-256: beebfa63911f2063708fe2d0a8e9c17f74caac45ca1036a18e6141542b6be7e4
font_01_sfnt_off000111fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FD 10764 bytes
SHA-256: 6d9ea82266782fe2dbedbb0b7169873dda923073bd1d32f18f6e4b89d5d0fd3d

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