Malicious PDF — malware analysis report

Static analysis result for SHA-256 d880855e5112abca…

MALICIOUS

PDF

67.9 KB Created: 2020-12-19 00:41:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7ca3e4bf158d4166aed911ed7e304675 SHA-1: 27bfa508db1c14578f8571b8a4e992fe3b8da825 SHA-256: d880855e5112abcac332b8bef1ca02dfbe50280d87bce67dc352bfb1dd79a2cb
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains references to 'Endnote citation manager free' and 'wkhtmltopdf', likely serving as a lure to drive traffic to the listed URLs.

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
  • 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.
  • 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://trafffe.ru/aws?utm_term=endnote+citation+manager+free PDF link annotation
    • https://dudikojegak.weebly.com/uploads/1/3/1/4/131406444/kofituro_rupozosijapez_miwemasebugul_ginejuwako.pdfIn PDF document text
    • https://palifeselaliku.weebly.com/uploads/1/3/4/4/134441248/8410249.pdfIn PDF document text
    • https://digagewopaloz.weebly.com/uploads/1/3/4/6/134634746/3e8d1d01d77763.pdfIn PDF document text
    • https://nofevezim.weebly.com/uploads/1/3/4/7/134770192/6677304.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461249/normal_5fc99410bbd64.pdfIn PDF document text
    • https://fogakorix.weebly.com/uploads/1/3/3/9/133997140/390c03f035a8e3.pdfIn PDF document text
    • https://bosuzegenelulu.weebly.com/uploads/1/3/4/1/134131522/5101524.pdfIn PDF document text
    • https://fotofewoxa.weebly.com/uploads/1/3/4/8/134849098/31fdff2b4ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389576/normal_5fc6f06d396a1.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/1390789.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_5f951218e3c8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389586/normal_5f9ad8e862e4c.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/sixenogafopoj/burofaxifasuwerariletin.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_off0000b6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F2 5088 bytes
SHA-256: 5b27af44e1f031b8151a9459d346bfcd44c2eb57de06b99b44f1560cff71551c
font_01_sfnt_off0000c82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82F 10924 bytes
SHA-256: a5dc3f08183c60d630c419122a2d1cb56e47ad01abb8a79cf888c27f271109b8
font_02_sfnt_off0000eda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA5 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61

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