Malicious PDF — malware analysis report

Static analysis result for SHA-256 0450c1d5548b8151…

MALICIOUS

PDF

82.3 KB Created: 2021-03-10 09:05:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a0f1ce035d9a48b5e343367876677f2f SHA-1: 2241de0a9869741b25a554fda312f6c2b37195d7 SHA-256: 0450c1d5548b8151e7345dd7fbec6082ded9c6e9af1bcddcf36a23ccfdc7c38e
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL, 'https://midufefew.ru/strik?utm_term=pals+rewards+number+lookup', is likely used to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://midufefew.ru/strik?utm_term=pals+rewards+number+lookup PDF link annotation
    • https://wuvalarovujed.weebly.com/uploads/1/3/4/2/134266489/9115557.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416506/normal_601d176fad506.pdfIn PDF document text
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/ruraxexakesav_dojabu_gidoxefawexim.pdfIn PDF document text
    • https://cdn.sqhk.co/sepufaziru/ku8hje4/mini_motor_racing_x_ps4_trophies.pdfIn PDF document text
    • https://kidamevu.weebly.com/uploads/1/3/1/4/131437276/fanizopaxos-faxomonon-xodaxareruta.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386347/normal_5fc5b1d5d219f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389809/normal_601e82db7bd5d.pdfIn PDF document text
    • https://pijaremurepapo.weebly.com/uploads/1/3/1/4/131406688/5233380.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/jcifhe0/74466604793.pdfIn PDF document text
    • https://dofudovi.weebly.com/uploads/1/3/6/0/136092117/1886665.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f095685-fde7-4695-95cb-48fe47ddf79b/55085901368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41e5c7c1-7cbb-4751-b825-2681c71bf328/2006_suzuki_boulevard_c50_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be2338a8-b869-46e2-8077-82c4d361be2c/lusebifenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f896b7f2-37bf-4e60-944e-cd76a61cea22/identifying_irony_when_mr_goodenwell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1e83327-0180-48ef-b308-308bf7dd88ee/does_the_shield_hero_fall_in_love_with_raphtalia.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_off00010533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10533 5404 bytes
SHA-256: e8365447f0932bd3af3fd87498bf8ba0dc4a20f97d1b3385d4dc391a3edb87c7
font_01_sfnt_off00011785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11785 10864 bytes
SHA-256: a9c9ea589c95a2b138485619aa25f1d0a0997601b90e75d0f2b757bb97c09bd9

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