Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b166a31aeea34a4…

MALICIOUS

PDF

86.2 KB Created: 2021-02-15 20:12:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 533be3d125e5ad08677171dd5049228f SHA-1: 4ac0573fc19910b737a551401807feb2dc054f4d SHA-256: 0b166a31aeea34a4d871bf0183aaebfecc77707754e7b7be11534c1bcc46c3b6
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, including a critical alert for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the embedded URLs point to various disposable hosting services. The primary attack pattern involves luring users to a malicious URL under the guise of a software download, likely leading to further malware infection.

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://crophysi.ru/wb?keyword=font%20creator%20program%20free%20download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412757/normal_60196830abb72.pdfIn PDF document text
    • https://fotavimapuwe.weebly.com/uploads/1/3/2/8/132816041/9110606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_601a6a8507fd8.pdfIn PDF document text
    • https://dapodufez.weebly.com/uploads/1/3/3/9/133997146/7626700.pdfIn PDF document text
    • https://wusaworapivuwor.weebly.com/uploads/1/3/4/6/134659128/7758516.pdfIn PDF document text
    • https://remitibomuko.weebly.com/uploads/1/3/4/8/134853657/1862525.pdfIn PDF document text
    • http://ductsunlimitedins.com/tutefelutezubiqrrgh.pdfIn PDF document text
    • http://pannochki-art.com/perebevimamasoxowiwkel99.pdfIn PDF document text
    • https://cdn.sqhk.co/zixifazod/QyFXOgh/throne_of_glass_books_age_rating.pdfIn PDF document text
    • https://cdn.sqhk.co/vilonunufuk/gdgjjaJ/gesegukuno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_6027cb9f564f6.pdfIn PDF document text
    • https://lulofaki.weebly.com/uploads/1/3/1/4/131453598/4539557.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/hcVgin3/crazy_coincidences_you_won_t_believe.pdfIn PDF document text
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/legijatapebadu-mapasunimefesep.pdfIn PDF document text
    • https://xixemoxutosiseg.weebly.com/uploads/1/3/4/4/134473276/a8be5118.pdfIn PDF document text
    • https://sepiximefajo.weebly.com/uploads/1/3/4/8/134849953/b14aad71561.pdfIn PDF document text
    • https://buxomajuse.weebly.com/uploads/1/3/4/5/134588570/d4525ca7611406e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410414/normal_5fd782d671200.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
    • 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_off00010618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10618 5084 bytes
SHA-256: f897c455b6b14fd50201d78b56fd1edce533f781ebab7c45381d6bd7b83050f7
font_01_sfnt_off0001175a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175A 11304 bytes
SHA-256: cf4b91cd47fa77115dd1fca79e2935cb9abe22e5d4c80b184bdfd9058d4fed52
font_02_sfnt_off00013d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

Open this report in the interactive analyzer, or submit your own file for analysis.