Malicious PDF — malware analysis report

Static analysis result for SHA-256 c356b0f6b462d4ae…

MALICIOUS

PDF

75.9 KB Created: 2021-05-22 17:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c15fc93b8dab091cfa51c337e6948720 SHA-1: 651148858c2d87a3ded394341f995f736f769e05 SHA-256: c356b0f6b462d4ae92b51e74a2fc9544c9807b96224cfe6226c4f03819b8ea06
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to 'https://zajinet.ru/strik?utm_term=kaabil+full+movie+download+2017+filmywap', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, further supporting this. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/strik?utm_term=kaabil+full+movie+download+2017+filmywap
    • https://vefavufarexuba.weebly.com/uploads/1/3/4/3/134315694/zaxumuzixiximiji.pdf
    • https://dowanolisedu.weebly.com/uploads/1/3/6/0/136056386/4410896.pdf
    • https://cdn-cms.f-static.net/uploads/4405930/normal_5fd60c75f145e.pdf
    • https://cdn-cms.f-static.net/uploads/4408707/normal_60121f0b3678a.pdf
    • https://cdn-cms.f-static.net/uploads/4413735/normal_606bc44218b5e.pdf
    • https://cdn-cms.f-static.net/uploads/4403808/normal_6028cc70084be.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0a25e2f1-94b1-46ec-abd2-1e3064945d44/8037217366.pdf
    • https://uploads.strikinglycdn.com/files/abfe8f40-ef69-4445-8ece-df257cc2324b/fisewoxulusos.pdf
    • https://uploads.strikinglycdn.com/files/c6dba447-7aa4-4262-bd45-e7ae90c7770a/is_chronic_pain_a_nursing_diagnosis.pdf
    • https://s3.amazonaws.com/gogunabones/pizamuweg.pdf
    • https://uploads.strikinglycdn.com/files/48dfc9ea-d29b-44a1-989a-ab86b6cb0f99/why_is_my_mobile_hotspot_not_working_on_my_computer.pdf
    • https://s3.amazonaws.com/jimugivos/zoguweraropesiwinomeva.pdf
    • https://uploads.strikinglycdn.com/files/22c1918b-13d5-4ccc-a023-e58638054b06/tapazadusegozeba.pdf
    • https://uploads.strikinglycdn.com/files/8cf0fe70-3c92-4201-a352-b11ab59fc955/nonunewo.pdf
    • https://uploads.strikinglycdn.com/files/6dc57f8d-6a1a-4b39-a517-dbf5d297eb61/germany_in_1910.pdf
    • https://uploads.strikinglycdn.com/files/87849f45-e496-4b0a-8c31-7f516c7cf529/62481891855.pdf
    • https://uploads.strikinglycdn.com/files/f73579e1-99d4-4f2c-a631-34ad9530dfc1/java_gui_tutorial_netbeans.pdf
    • https://uploads.strikinglycdn.com/files/7ff6b69f-52b7-4e8a-bb65-a9551cdfd6a7/lean_six_sigma_black_belt_certification_canada.pdf
    • https://uploads.strikinglycdn.com/files/ab234398-d0af-4a35-ad29-07634091d8ae/24236403030.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_off0000eaea.bin
c52cd33cb63124ca66037208c3577bdf03cd99a260732f53e5bac5b3eaa33124
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEA 5684 bytes
font_01_sfnt_off0000fe61.bin
a45b497ce08326b47b2f4ab8492081c9c30335e86475b8c0b0bd0115ce99f8eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE61 10528 bytes