Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9bc5c659fc75670…

MALICIOUS

PDF

74.5 KB Created: 2021-03-25 18:04:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 00f26181f231f45e939694f7fef68c44 SHA-1: df9917d2f6d00e0b3a98d1ba260431c3b7c0c0f3 SHA-256: f9bc5c659fc75670d3865fd2c330e07166ad13a463e1dec22b7726320cba1479
196 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is part of a link farm or SEO scam, directing users to external URLs like https://mezovuduw.ru/wix?keyword=orvis+watch+repair. ClamAV detection and ML classification confirm its malicious nature, identifying it as a phishing trojan. The document body, though heavily obfuscated, contains keywords related to watches and repair, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://mezovuduw.ru/wix?keyword=orvis+watch+repair PDF link annotation
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/1027184.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500450/normal_5ff2de6833b50.pdfIn PDF document text
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/1888287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422914/normal_603ceb3b3cd11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366350/normal_5fcca1a5bb640.pdfIn PDF document text
    • https://bemilinup.weebly.com/uploads/1/3/4/3/134390274/malidu-tisutojogikug-turosawopi.pdfIn PDF document text
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/petiweroluboz_betokikaxozazet.pdfIn PDF document text
    • https://nisixokavenofaf.weebly.com/uploads/1/3/4/8/134891603/870f08e8a83c6a.pdfIn PDF document text
    • http://bomumerodozo.22web.org/beating_the_street_book.pdfIn PDF document text
    • https://duxotitur.weebly.com/uploads/1/3/4/5/134596147/fafunedoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456393/normal_6004432e4a1ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390382/normal_602403dfdde08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504870/normal_602fdd2981207.pdfIn PDF document text
    • https://feronokemafa.weebly.com/uploads/1/3/1/1/131164109/485495.pdfIn PDF document text
    • https://xuvelufuxilo.weebly.com/uploads/1/3/5/3/135387868/gatokavunijuj_fodix_powuvexisu_betuki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366014/normal_5fc8727c0e6ac.pdfIn PDF document text
    • https://futesofabi.weebly.com/uploads/1/3/4/8/134891928/3871462.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405642/normal_5ff94331affdb.pdfIn PDF document text
    • https://talogaxuzule.weebly.com/uploads/1/3/4/5/134596774/a42bf8ffc1fa6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kikasipab.epizy.com/ray_optics_mcq_questions.pdfIn PDF document text
    • http://getetir.epizy.com/consent_form_template_word_format.pdfIn PDF document text
    • http://kenukune.rf.gd/posoperunowudoloka.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_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 5168 bytes
SHA-256: 5fccf2460523d5feb4812585263142c32a6027c82c1936334bcc05e78c63c978
font_01_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 11308 bytes
SHA-256: 0fa05a28e52b30ff4279c4f070ad010f0b863e125310cb2e329a4eb1684588e5