Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f7dc2e6aff7e7b…

MALICIOUS

PDF

71.6 KB Created: 2021-01-24 17:34:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 262a1034a77cbdb7124f9898db83328d SHA-1: 0d090d67a1b511348b54b66eff90ead370053bab SHA-256: e1f7dc2e6aff7e7ba4ae786c1059be99653a3af3a383291428b7879921ba6919
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple links to external PDF files, with one link specifically pointing to a known malicious redirector. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest a tactic of creating a link farm to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://yafferge.ru/123?utm_term=remote+office+not+required+pdf+download In PDF document text
    • https://cdn.sqhk.co/nunemiziku/giolugg/pulejikaja.pdfIn PDF document text
    • https://komamezumef.weebly.com/uploads/1/3/1/3/131398541/9e04487626e.pdfIn PDF document text
    • http://euromarket.pro/wanekoshtcsl.pdfIn PDF document text
    • https://cdn.sqhk.co/zezaxemepe/0hdiejb/zimufuxebusijame.pdfIn PDF document text
    • http://soldatskaya6.ru/fifa_futsal_laws_of_the_game_2019h9thm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413703/normal_6005b6052436f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379601/normal_5ff4764e5a0bd.pdfIn PDF document text
    • https://cdn.sqhk.co/lupekute/Kp7gdgf/58429976141.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/e4VhbHk/dogs_are_talking_band.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/jiBihd2/how_to_write_a_basic_literature_review.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/Jgijigg/download_square_home_key_launcher_windows_style_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADE 5348 bytes
SHA-256: cce9a4279552606f35754236dad19c97068fcf13f541f05050f18983e3e3150a
font_01_sfnt_off0000ed12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED12 10636 bytes
SHA-256: 1e105a0c604c294294a1ecc835d57fad56f38cff6867dabe07c6f79a87cb1fc7

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