Malicious PDF — malware analysis report

Static analysis result for SHA-256 075e94713be92590…

MALICIOUS

PDF

69.2 KB Created: 2021-02-17 09:11:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b5140359f911e0ab400cf61f2dbc4ac5 SHA-1: ddef1b5c9acd758afe88314a80e239fe9a7245ec SHA-256: 075e94713be92590f4efbb76a3d6a38e026cf438b71a9cda2f7dc42cf1bbe26e
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 SEO spam operation. One embedded URL, 'https://leonvi.ru/strik?utm_term=what+causes+a+samsung+dryer+not+to+heat', appears to be a redirector for a search query, further supporting the lure-based attack pattern. No scripts were extracted, but the extensive link farm and malicious detection point towards a phishing or malicious redirection scheme.

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://leonvi.ru/strik?utm_term=what+causes+a+samsung+dryer+not+to+heat PDF link annotation
    • https://juzajepilokak.weebly.com/uploads/1/3/4/6/134682244/37aae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403808/normal_5fda572c7ae0d.pdfIn PDF document text
    • http://pribor-poverka.site/5391883581194yrg.pdfIn PDF document text
    • https://zijobezugol.weebly.com/uploads/1/3/2/6/132682913/sotujelozoferepas.pdfIn PDF document text
    • https://xabejopoturidu.weebly.com/uploads/1/3/4/3/134352457/9337775.pdfIn PDF document text
    • http://thesalle.xyz/how_much_do_interior_designers_make_in_floridajl92w.pdfIn PDF document text
    • http://idealsit.fun/belanger_kondor_parts_manual9kyzs.pdfIn PDF document text
    • https://xuwatezifi.weebly.com/uploads/1/3/5/3/135305435/632476e44b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_601904fed4bee.pdfIn PDF document text
    • http://vash-fasad.live/mario_kart_64_gameshark_codesma58m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408583/normal_6025682c8fa27.pdfIn PDF document text
    • https://jozevupipe.weebly.com/uploads/1/3/5/3/135346753/legumasu-bibutemasaj-moginewas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501777/normal_5fe10c0450c1a.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/lefemijip/adverbs_worksheets_for_year_2.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/turabimu.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_off0000d283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD283 5436 bytes
SHA-256: e8bcb8528d73b9e57e5557b7b006cd96e24893dd125bb12b67b70cd77242f419
font_01_sfnt_off0000e4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E3 10276 bytes
SHA-256: 411ccb80f780b7dd53fb706673d4466de0ee47bcfb48b0766d1c20b696c69a08

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