Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5386dc2fbc1926…

MALICIOUS

PDF

69.4 KB Created: 2021-01-14 12:01:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e196121ff296d49c90ff0a2302f8ac7b SHA-1: 1c3ad03f9cfbb043abdc2916a0ea823a02912ac9 SHA-256: 3f5386dc2fbc192617a1b2e513906e072c4ae9beed48b262787ba5e9d0335c0d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, 'https://traffset.ru/123?utm_term=poetry+spanish+pdf', is flagged as suspicious and likely leads to a phishing or malware distribution site. The document body, though heavily obfuscated, contains references to 'poetry spanish pdf' and application metadata, suggesting a lure to disguise the malicious intent. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://traffset.ru/123?utm_term=poetry+spanish+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389793/normal_5fc6d81ef2475.pdfIn PDF document text
    • https://site-1166068.mozfiles.com/files/1166068/chowdhury_and_hossain_english_grammar_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483833/normal_5faf70d86b07d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378406/normal_5f920bbbc39ee.pdfIn PDF document text
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/vigage_nojapusolarezux.pdfIn PDF document text
    • https://site-1171850.mozfiles.com/files/1171850/99356646814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376380/normal_5fe8268f4a651.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472481/normal_5fbb4f10984f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373769/normal_5f94d9c06ae99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486763/normal_5fc0bb9c81815.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/wazotojemov/watch_jersey_shore_season_1_episode_4_online.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/96313413492.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/bullying_in_south_african_schools.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/kebamovonupuman.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_off0000d2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DF 5200 bytes
SHA-256: 5403c63957e8938f466d725860944efdc2adc75cc1d26d49cb7bcca458977435
font_01_sfnt_off0000e494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE494 11292 bytes
SHA-256: 7b769f0fb56fcade0b729c875745b3810d83700ac1e75e1b27ec7dd0f5226d13

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