Malicious PDF — malware analysis report

Static analysis result for SHA-256 191527d2aaf7b38e…

MALICIOUS

PDF

76.9 KB Created: 2021-04-03 03:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b9f7876eb49ad48695901a72dfdba9c4 SHA-1: 24a38f91b1668bd86a3fe42e80238dd84e7ceaeb SHA-256: 191527d2aaf7b38e0fbbd57ce9e5052427bcd758c6a2a1a77e36aec467cd2532
184 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and an ML classifier, with critical findings indicating it's a PDF redirector to known malicious infrastructure. The embedded URL points to 'dafemum.ru', which is flagged as malicious. Although no scripts were explicitly extracted, the PDF structure and the malicious URL strongly suggest an attempt to lure the user to a harmful site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=bringers+of+the+light+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4415068/normal_601dcd9390869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495413/normal_600c578337b09.pdfIn PDF document text
    • http://bupitubegedew.getenjoyment.net/bticino_catalogo_2020.pdfIn PDF document text
    • https://niraniki.weebly.com/uploads/1/3/4/6/134662237/zifuvaluzi.pdfIn PDF document text
    • https://kekugijofer.weebly.com/uploads/1/3/5/3/135321092/wakizafisana_pizif.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/night_owl_wireless_1080p_panoramic_camera_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379053/normal_605ca9425a92c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/galinikagopit/sewosufuboviwagepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9da6a83d-0fb3-4b7e-a08a-70c2da0cf6e8/48252724989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3704ea8-ace6-4641-8ce3-a1fb094c0fd0/muwapexogudikoziwobidanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2af8ddd-d6ea-48fb-9fe4-370f86312ea0/maserati_quattroporte_2020_price.pdfIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_143f692d41dc44a381f53a3c27fac027.pdf?index=trueIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_62d58a72029f4d8bbdfcffb508f68d0b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/034e680b-7bb3-4901-b65e-ae958aeb23fa/the_brief_wondrous_life_of_oscar_wao_chapter_3_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/xamujuwudopajukopije.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57B 4932 bytes
SHA-256: 79de67ac231a50f5912b08d82d2ca8c97c15cfc01c714d5ac70b0e782ed830de
font_01_sfnt_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 10136 bytes
SHA-256: ec266996c6834405736308a871a6a98cee0a04e19746eb8cbf62de3f5881de77
font_02_sfnt_off000118f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F3 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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