Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f60a1318d0d02a…

MALICIOUS

PDF

77.7 KB Created: 2021-05-29 07:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0466c39d08609769507eec4b006c0934 SHA-1: 77f4cf4165c654afb51c8415d1cc83f0aee2e36f SHA-256: a1f60a1318d0d02ae8b8e0a579aa31e3a64a7a4e4ca8502a908a07f5662e0ce9
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to other PDF files hosted on disposable domains, indicating a link farm or SEO poisoning tactic. The primary URL, 'https://druttle.ru/strik?utm_term=how+to+read+a+cobra+radar+detector', suggests a lure to attract users interested in radar detectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

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://druttle.ru/strik?utm_term=how+to+read+a+cobra+radar+detector PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411501/normal_606de195ee7e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484363/normal_5ff52913207a1.pdfIn PDF document text
    • https://jijajaxasivezix.weebly.com/uploads/1/3/4/5/134588510/7788173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481552/normal_605f2b63430d7.pdfIn PDF document text
    • https://xuzojawuwakobo.weebly.com/uploads/1/3/4/3/134312069/5d8fdc.pdfIn PDF document text
    • https://kinuguno.weebly.com/uploads/1/3/1/4/131454024/2572123.pdfIn PDF document text
    • https://nimaxosonoj.weebly.com/uploads/1/3/4/8/134897368/9e73f460.pdfIn PDF document text
    • https://zufuleruzu.weebly.com/uploads/1/3/1/6/131637307/7192843.pdfIn PDF document text
    • https://zelerajolames.weebly.com/uploads/1/3/0/7/130776056/bosefuzuwux_dexum_nopisufuxapem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386095/normal_5fd0988c61496.pdfIn PDF document text
    • https://bunonosuvon.weebly.com/uploads/1/3/5/9/135976801/benezeki_jabisevibedo_fulomerasevule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427284/normal_604846c1d8718.pdfIn PDF document text
    • https://zulewawasukuxu.weebly.com/uploads/1/3/4/5/134581955/a0bf7ef496793.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393485/normal_5fe23e86623d7.pdfIn PDF document text
    • https://vogovolakufa.weebly.com/uploads/1/3/4/8/134874318/nosuwezekuzesonufud.pdfIn PDF document text
    • https://bamiwesuwo.weebly.com/uploads/1/3/5/3/135390748/f9e0379cfbff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c64cfc27-786b-4639-a587-cb7a7c1f08f7/42900959493.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2194591c-b996-46b6-9ff7-9ce111e6b6e4/how_does_the_maze_runner_death_cure_book_end.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36f0badb-18b1-4659-a634-371d06c634a2/31936767047.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_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 4916 bytes
SHA-256: cb35543f32e177d561b7960bb5bcdb4ffff7621462c3e0ed50856a23b5140c7f
font_01_sfnt_off00010493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10493 10924 bytes
SHA-256: faeb0e0e01c29e645f5c7c7e391f84519b9dee625e55074d687265bd6b92a9d0

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