Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5667bfc7bcbdba…

MALICIOUS

PDF

74.8 KB Created: 2021-02-18 12:40:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7841b4492db77e8dae8d86b3c2a2ba03 SHA-1: 0ca3614665549cb695d2ec0af2ac173fc0bdf894 SHA-256: cb5667bfc7bcbdba64f1963e0be752f37fa9878b2ddb5a70ac68cbfe9cccd268
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, with at least one redirecting to known malicious infrastructure (https://yafferge.ru/strik). The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document's structure and link farm behavior suggest it's designed to lead users to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=norse+mythology+book+pdf In PDF document text
    • http://kdghy.online/594435497426p1yt.pdfIn PDF document text
    • http://awpmode.com/577436621587k9oc.pdfIn PDF document text
    • http://reestr.site/police_constable_exam_questions_and_answersqyzpu.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/6420074.pdfIn PDF document text
    • http://ighelpcenter.xyz/sunozupaziwivnruin.pdfIn PDF document text
    • http://amst-watch-v2.club/fulutozamibigenikigukijoavw4h.pdfIn PDF document text
    • http://leomannapov.com/35801404714yxz72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425908/normal_600135067819d.pdfIn PDF document text
    • https://tapogizixe.weebly.com/uploads/1/3/4/8/134897788/2726c61f26f14a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368235/normal_5fde52a745d6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403117/normal_602be5276d90f.pdfIn PDF document text
    • http://ita-talia.fun/21388592300j33r9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373508/normal_5fca7aaba2ac6.pdfIn PDF document text
    • https://zuzuvisaze.weebly.com/uploads/1/3/0/7/130738998/fosesuvit-muvomibanenaz-nefozemotomaza-wagilujij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464077/normal_5fde31f37f805.pdfIn PDF document text
    • https://bumobuzeki.weebly.com/uploads/1/3/4/4/134477779/nujebazetosemumin.pdfIn PDF document text
    • http://akmurzina.com/tafisutapirobobenuxeae54u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/angular_2_formcontrolname_set_value.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/relupa.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_off0000e8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DB 5520 bytes
SHA-256: 791e7825e7a27e32eff9e085e6f723d1d9104155482e2bfcf3ba37dde0a946af
font_01_sfnt_off0000fb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 10132 bytes
SHA-256: ba878880ca26fda79b41227d3a6b4a8c962664e6ef096929e20d1f977156accc

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