Malicious PDF — malware analysis report

Static analysis result for SHA-256 c079b5edef7b3d3e…

MALICIOUS

PDF

63.0 KB Created: 2021-02-22 03:05:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bb04147ac8df4575dc727e5d8e1f7313 SHA-1: 6c905bef180169d62047e220ac0929edeeb5b640 SHA-256: c079b5edef7b3d3e0a0cbabb22d9f863b0ec8dd9c1a1b24ee0c2560e89367e98
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, including one pointing to 'leonvi.ru', which is likely used to redirect the user to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The document body, though heavily obfuscated, suggests a lure related to office supplies, potentially to disguise a phishing attempt or malware download.

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
  • 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://leonvi.ru/wb?keyword=swingline%20heavy%20duty%20stapler%2039002%20parts PDF link annotation
    • https://wavurujubatebar.weebly.com/uploads/1/3/2/6/132682053/zebaw-nogojituxodona.pdfIn PDF document text
    • https://wuginimujewege.weebly.com/uploads/1/3/4/7/134714977/nemew_tililubigus_wovowude.pdfIn PDF document text
    • http://maykistore.ru/956781557212lxuf.pdfIn PDF document text
    • https://vefonero.weebly.com/uploads/1/3/1/0/131070196/3585939.pdfIn PDF document text
    • https://cdn.sqhk.co/vukupamita/jd4hdhh/6388450856.pdfIn PDF document text
    • https://nuzunovi.weebly.com/uploads/1/3/5/3/135314570/pekujel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409257/normal_602f74664fd2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453743/normal_600f73ff3756f.pdfIn PDF document text
    • https://cdn.sqhk.co/ruselaguzoda/UnGhggi/the_galaxy_survivor_mod_apk_latest_version.pdfIn PDF document text
    • https://cdn.sqhk.co/pibilebomek/jfBsaql/6259909071.pdfIn PDF document text
    • http://reliables.ru/competencias_martha_alles8bonf.pdfIn PDF document text
    • https://cdn.sqhk.co/xakutofi/hgYhcji/buwonewit.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/sabegokek/54223499746.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/nuzep.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/47048445807.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_off0000b52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52D 6172 bytes
SHA-256: 2666abb04bc4bfdf3e4ff8e99252b58087a0561607b8f7072153c298caf7ab67
font_01_sfnt_off0000ca39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA39 10368 bytes
SHA-256: cc137ab29ea829ba5aeb2a2e080dcd30c92098619a1e5ea59e8576d82bf88b5d

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