Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c8b85aae2044e4…

MALICIOUS

PDF

113.3 KB Created: 2021-04-16 12:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3ec3eecea6a85e17548ecbfddcfe0076 SHA-1: b31225f17062099d05db7a83acd4ac1b6c6fb1b1 SHA-256: a4c8b85aae2044e4c4c0dd132705fa6aecdd9ce9aa5e38223b56a767d9e5f03f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The embedded content, though heavily obfuscated, appears to be part of this scheme to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=is+the+wall+game+show+coming+back+in+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449990/normal_5fc6a966677fe.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolefowi/cibxOfI/35452471694.pdfIn PDF document text
    • https://cdn.sqhk.co/kefivaxepaj/gmijQif/free_full_length_cartoon_movies_on_youtube.pdfIn PDF document text
    • https://piwirajaluz.weebly.com/uploads/1/3/5/3/135312697/a657883f6.pdfIn PDF document text
    • https://cdn.sqhk.co/kitolitik/agKkkhb/cat_evolution_clicker_game.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/hB6kVJc/xorubosese.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470038/normal_5fc995f28a6c0.pdfIn PDF document text
    • https://cdn.sqhk.co/tavanaru/hhO68ja/happy_glass_full_level_122.pdfIn PDF document text
    • http://guxetiz.22web.org/behringer_bcf2000_daw_controller.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459929/normal_60687795db91d.pdfIn PDF document text
    • http://xujilutobidiko.iblogger.org/cdac_entrance_exam_syllabus_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375507/normal_60250a36a4634.pdfIn PDF document text
    • https://pavibizad.weebly.com/uploads/1/3/0/7/130740264/1817869.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d6504552-49b0-4b7d-b1ff-94f9e1082b83.filesusr.com/ugd/1f0558_f1819c169a9d42d68b1ba321af685d54.pdf?index=trueIn PDF document text
    • http://xipokawopigigig.epizy.com/17930060144.pdfIn PDF document text
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_33290c39b7fb4a9482f492fb863a545a.pdf?index=trueIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_618b5d2db8da4dc98c1d165aa11368aa.pdf?index=trueIn PDF document text
    • https://e0529b0e-ffd4-46ae-8a9e-348c3aa8e3ae.filesusr.com/ugd/27320f_3b0d2a650a7745dd93929cc92ae7eab4.pdf?index=trueIn PDF document text
    • http://setewexevevel.epizy.com/dewukujekabudumezon.pdfIn PDF document text
    • http://xolinupumilafud.epizy.com/brother_hl-2280dw_printer_wireless_setup.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_off00017aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AAB 5624 bytes
SHA-256: 25f9566b3dd47bab60db9602de9cdbb72119c4b2689532a8039e1d39b9ed9f18
font_01_sfnt_off00018dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DBF 12632 bytes
SHA-256: 6e5d8bcd2e695d8bfd84ec11886843bbfc610428ccc30eeee72967eaa58ef0a4

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