Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c093b81c3c1c2c…

MALICIOUS

PDF

77.4 KB Created: 2021-02-08 04:13:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e8a2ccd085c81204f65794c8e1d3dcaa SHA-1: aa085a1fa8ce540c422120d0fd4f2fe1ca1bcec7 SHA-256: 31c093b81c3c1c2c3f71a592664e1922e676e9d0d9f56f971f0425eaba8d887b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs and is identified as a link farm, with several URLs pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

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
  • 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/123?utm_term=rappelz+soul+pets PDF link annotation
    • https://cdn.sqhk.co/tononapiwaso/aggKjd7/gotoxinajigorilonu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502721/normal_5ffc36e302941.pdfIn PDF document text
    • http://nawilojobate.iblogger.org/nhs_guidelines_inner_ear_infection.pdfIn PDF document text
    • https://cdn.sqhk.co/luwukamuku/hhbJlia/85174461070.pdfIn PDF document text
    • https://cdn.sqhk.co/sarafogu/ibghFaQ/country_music_charts_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/gexopoku/RywDAjc/top_rock_bands_of_the_90s_and_2000s.pdfIn PDF document text
    • https://cdn.sqhk.co/rubogomuweme/hgiedo9/63877311281.pdfIn PDF document text
    • http://piriketag.22web.org/apsc_camera_full_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460060/normal_5fe90c49805cd.pdfIn PDF document text
    • http://tuvugisuxizew.iblogger.org/burning_man_movie.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/jeponowon/b._ed_form_fill_up_2018_assam.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/alberta_rental_inspection_report_form.pdfIn PDF document text
    • http://zupotid.epizy.com/ambito_social_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/1734332719.pdfIn PDF document text
    • http://kuvujibirili.epizy.com/autocad_software_free_2016.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66E 4504 bytes
SHA-256: 54a7ac12d037b0788ec5c340654489a5fb86cc803f44b880a8252bdb9d09f486
font_01_sfnt_off0000f5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D6 10788 bytes
SHA-256: 60b9e14448cb4a0b45b79558e782e606709bdbc85af4cbfca7aea6dca2a91d17
font_02_sfnt_off00011ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC5 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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