Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f276b95ce0a225…

MALICIOUS

PDF

65.4 KB Created: 2021-02-16 16:45:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8c767b201c6ddd893b987b0a9534847c SHA-1: 378c5a21b192136bd916cd580ab80538cd29c836 SHA-256: c7f276b95ce0a225fbd2868ac56e9944a698658a8938f7a189ee11c6cb72be1a
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://crophysi.ru/strik?utm_term=accu+chek+performa+softclix+lancets`. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to other PDFs. The ML classifier and ClamAV also flagged this file as malicious, indicating a high likelihood of phishing or malicious redirection.

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
  • 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 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.
  • 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://crophysi.ru/strik?utm_term=accu+chek+performa+softclix+lancets In PDF document text
    • https://cdn.sqhk.co/rutunidosaw/qlhjjae/heroes_evolved_discord_fr.pdfIn PDF document text
    • https://cdn.sqhk.co/nutakurij/KImyVgi/drag_racing_top_speed_supercarrier.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389127/normal_5ff5858287b13.pdfIn PDF document text
    • https://sagetiruguw.weebly.com/uploads/1/3/0/8/130814856/126317.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/bgiheQu/72115742981.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/jihghg8/dobudopexizilugut.pdfIn PDF document text
    • https://cdn.sqhk.co/vitozogog/xpjbR0S/clash_of_clans_electro_dragon_attack_strategy.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/gjighG5/59431010220.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/jiF0hfe/nepak.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/xunilukegez/65836040484.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/gidugijokoxamarimilewixex.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/muworugeli.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_off0000c390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC390 5376 bytes
SHA-256: 0ced114ce5e4e31c8bcc0ecf98d8de00001ce18f6ddab781559980655e983672
font_01_sfnt_off0000d5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B2 10416 bytes
SHA-256: 94c687bb67b5d25e7de12abd91584893bcac7133c0b71f30b9003983ad6eba9f

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