Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b77e446f387831…

MALICIOUS

PDF

67.5 KB Created: 2021-03-09 06:45:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8c198353cfb6119e9b847fd157729a70 SHA-1: fe8f5770b34b5f83127cc070f751e6a581031058 SHA-256: 82b77e446f3878315d1be26615e0739f791fb0cdcadb32623dfd6e5bba8f1f71
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The presence of a URL like 'https://botokaw.ru/123?utm_term=chellame+tamil+full+movie+hd' indicates a lure to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://botokaw.ru/123?utm_term=chellame+tamil+full+movie+hd PDF link annotation
    • https://vedexojofidas.weebly.com/uploads/1/3/4/5/134581268/fc27369.pdfIn PDF document text
    • https://cdn.sqhk.co/wafudovop/ibJqjb2/fivelelamotobu.pdfIn PDF document text
    • https://cdn.sqhk.co/xugumewaz/hYqtfZq/32238908156.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465387/normal_5fe2b6bb67929.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470828/normal_60021d64db43c.pdfIn PDF document text
    • https://jimilosebot.weebly.com/uploads/1/3/4/0/134096588/werudofebiwijunifimo.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxodokoju/9cjchfy/first_aid_for_burns_ppt.pdfIn PDF document text
    • https://bupefozatige.weebly.com/uploads/1/3/4/3/134384552/2757917.pdfIn PDF document text
    • https://cdn.sqhk.co/disonixures/L6ifK1k/fitness_ball_exercises_for_back_pain.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/iiUbMif/pumubedijabifizufinuwazo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488581/normal_603a11c135b09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jorowiwiboxizuk.rf.gd/57476991840.pdfIn PDF document text
    • http://jogulele.epizy.com/fogevovizasififow.pdfIn PDF document text
    • http://xozoxazoku.epizy.com/86161712829.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/v_tr_carl_sagan.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/convert_to_editable_word_android.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_off0000cc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC37 4840 bytes
SHA-256: 2322b041d8a6b47e2130df769893fa5970d2edc9203512fce6ee253e90ae0191
font_01_sfnt_off0000dc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8F 10976 bytes
SHA-256: 2055f3cc06a20a3a80081de5bcfb3bc5ea3f1a3afb0c161961f84fd1b3635a86

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