Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6be406af6523a5…

MALICIOUS

PDF

77.0 KB Created: 2021-01-13 01:43:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 153e5e961734cf426ecdcafed5eb16ef SHA-1: e0f747a24255eba056d84d3da963e7f19db3b8fb SHA-256: 4c6be406af6523a5429bb1dcfbfca68607e881cda2a905e0843e72c04e67221b
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of numerous external links points to an attempt to direct users to malicious infrastructure.

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
  • 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.
  • 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://ggtraff.ru/aws?utm_term=business+law+cases+and+answers In PDF document text
    • https://static.s123-cdn-static.com/uploads/4377674/normal_5fc7551721aa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369179/normal_5f889b453b29c.pdfIn PDF document text
    • https://site-1178301.mozfiles.com/files/1178301/22121649653.pdfIn PDF document text
    • https://mokoxofedig.weebly.com/uploads/1/3/4/8/134891763/cc84755.pdfIn PDF document text
    • https://site-1171784.mozfiles.com/files/1171784/vorifilipun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_5f9181b7028bf.pdfIn PDF document text
    • https://site-1171899.mozfiles.com/files/1171899/konovezuwerulur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529095/normal_5fb7f4ca2ae81.pdfIn PDF document text
    • https://bufudelazevel.weebly.com/uploads/1/3/4/7/134734798/wolalexujavogiw.pdfIn PDF document text
    • https://noxagutut.weebly.com/uploads/1/3/4/4/134483949/cfa60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416494/normal_5fad8434111d6.pdfIn PDF document text
    • https://site-1177693.mozfiles.com/files/1177693/respect_is_two_way_traffic_meaning.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/tevomenil/more_than_less_than_crocodile_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/57805399295.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_off0000f0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D1 5072 bytes
SHA-256: f980c7280c49064c2f9628da02a0242c92bf6e44732df4c71cb2f0096057c63e
font_01_sfnt_off00010231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10231 10796 bytes
SHA-256: 873c099fa383a2332de93856718a1e1cf0904aa8901919be5c9c418eeb089074

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