Malicious PDF — malware analysis report

Static analysis result for SHA-256 415950491be6cf15…

MALICIOUS

PDF

77.5 KB Created: 2021-03-21 07:06:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fe7f6ba307bc429115c102efb41968e0 SHA-1: b079c327bf7a0abfeb1ba6eeec0b193f4d5bc30a SHA-256: 415950491be6cf15619d60f40b7d71142aa2e2438fbb55fb4eb2c5cc2a7317e3
244 Risk Score

Malware Insights

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

The PDF contains a large number of links to external websites, many of which are hosted on disposable domains or known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document body is heavily obfuscated and appears to be a lure for search engines, aiming to attract users searching for specific PDF content.

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
  • 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 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.
  • 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=human+geography+definition+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388617/normal_601a7f1616271.pdfIn PDF document text
    • https://lavivatum.weebly.com/uploads/1/3/1/4/131437335/fizavesenavipoti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_60316fd27f72c.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/fahihgc/lipotabuvililuz.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/ieVjd5K/99930401541.pdfIn PDF document text
    • https://cdn.sqhk.co/pitekofotada/jaAgfgh/steps_in_the_business_strategic_planning_process.pdfIn PDF document text
    • http://gk-kuban.ru/what_are_some_transition_words_for_a_conclusion0dn6l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450338/normal_603d44b2cd010.pdfIn PDF document text
    • https://cdn.sqhk.co/semexixok/VtZifjh/zedizukapapu.pdfIn PDF document text
    • http://myluckybet.xyz/what_is_an_example_of_a_specific_purpose_statement2lsvn.pdfIn PDF document text
    • https://kogekotosejikol.weebly.com/uploads/1/3/5/4/135400664/397dd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374181/normal_6047b060704c3.pdfIn PDF document text
    • http://intereriia.com/designs_for_ppt_presentation_free79aqf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_32ef90a7e8364f7fac0dc500a26d8394.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4c20b6f-88a9-46c7-bad7-512275ccc37c/wagner_flexio_590_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/728a7ca8-5f4a-4d7a-9b1b-5fe394c41cfc/how_to_pronounce_words_in_navajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b42556b3-fd2d-41b8-b795-5d075a7a5e0a/9001_iso_2015_clauses_ppt.pdfIn PDF document text
    • https://3064a0a7-8496-4b95-be1e-56094aee372f.filesusr.com/ugd/0cf4b9_a718fe56ea6e487f8ae3f1eee455133f.pdf?index=trueIn PDF document text
    • https://29ce6865-365c-47c4-9f0a-635d6f965865.filesusr.com/ugd/0d6b77_29b97a6e39524da19e53dafb12d04371.pdf?index=trueIn 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_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 5308 bytes
SHA-256: a465ab538964428a31b4392c39f9706d350136fffe3ec59f584e3f5779656513
font_01_sfnt_off00010585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10585 10264 bytes
SHA-256: c232959dd54d0c6abc5c75a3e59e6f1ab82edc8c50e153b576e8bb96dd882d3f