Malicious PDF — malware analysis report

Static analysis result for SHA-256 759ccea530a126be…

MALICIOUS

PDF

96.8 KB Created: 2021-02-20 20:27:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ac9019b17d9953195e2d635205bde94c SHA-1: d60063905133b28318b1d4b4d1915eeb12e93c05 SHA-256: 759ccea530a126be24db110ae401fe3070eb4dc3aeb8022062ebcf3e8f29ac31
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains an embedded URL that redirects to a link farm, likely as part of a phishing or scam campaign. The ML classifier strongly indicated maliciousness, and the document body's content is nonsensical, suggesting it's a lure. No scripts were extracted, but the presence of multiple disposable domains and UTM parameters points to a coordinated effort to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://bologen.ru/strik?utm_term=who+is+the+ugliest+girl+in+kpop PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446272/normal_602e4539ee058.pdfIn PDF document text
    • https://cdn.sqhk.co/mezomabesoki/vZYiaMP/kefeteperurobevuzatu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486566/normal_601a0fb713090.pdfIn PDF document text
    • https://pumurepuwalor.weebly.com/uploads/1/3/5/9/135978845/2728858.pdfIn PDF document text
    • https://selamosufuk.weebly.com/uploads/1/3/4/4/134463567/woniluluf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451230/normal_5fcf5e3ba8a19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427783/normal_5fce694e57dc3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459341/normal_5fce568829002.pdfIn PDF document text
    • https://nixifekenebuj.weebly.com/uploads/1/3/0/7/130775280/vafitapok.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/TidMRgj/22894056748.pdfIn PDF document text
    • http://pasendapp.online/wemunanizexedaguwinudu1qa7j.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/bupaxomu/gavotte_from_mignon_a._thomas_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/carhartt_size_guide_womens_uk.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7F 4948 bytes
SHA-256: c3141348f42166eab2ca5f97f96e7cf83da41f449462e46fed7ff2797f01dbf8
font_01_sfnt_off00013064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13064 15160 bytes
SHA-256: 581aa9e60f81610bb41c03d660e415dd6bae81454923e82bb191e2541471bf01
font_02_sfnt_off00015fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD4 16492 bytes
SHA-256: 1f662b39a2a717c5ec182852f16dc45c32bacd31de21680b61b23ea4ee6a2b20

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