Malicious PDF — malware analysis report

Static analysis result for SHA-256 586401c028daacab…

MALICIOUS

PDF

68.4 KB Created: 2021-01-30 17:59:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f91808628122f17100ec1e4947e7a6f6 SHA-1: 7eee02619e68fb159914feb6ff2d696636887a0c SHA-256: 586401c028daacabd4743f5ae03cd8ce6ad05abcba12320b2124ee93333426cf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to drive traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection or exploitation.

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://crophysi.ru/123?utm_term=unblocked+games+slither.io+66 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4496810/normal_5ffd44a324b14.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/WQ6PJSt/junegubozuserunozid.pdfIn PDF document text
    • http://lirerigoteses.22web.org/nazataniwolipizut.pdfIn PDF document text
    • https://fikomepa.weebly.com/uploads/1/3/5/2/135299400/4db2fe688.pdfIn PDF document text
    • https://cdn.sqhk.co/jagapifa/iiOZHge/animal_cat_ringtone_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gebijowokobe/sbnjhhj/dj_sound_effects_machine.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489979/normal_5ff20aee55cc8.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxomawelej/hcshcGS/two_asteroids_collide_2020_august.pdfIn PDF document text
    • http://itrom.fun/moonlight_sonata_partituranxsbk.pdfIn PDF document text
    • https://tazipapanora.weebly.com/uploads/1/3/0/7/130776418/fukobiwuji_wavojizafinale_jekapitamugow.pdfIn PDF document text
    • https://cdn.sqhk.co/savimatuv/s7v4jhJ/radio_italy_news_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lafasusatar.rf.gd/jelejuxinezupozebem.pdfIn PDF document text
    • http://volajigatume.epizy.com/18798150803.pdfIn PDF document text
    • http://lonelogu.epizy.com/56649626453.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE7 5732 bytes
SHA-256: 2cfaa6b32ae0149bd33781a25390a4f5b1e3a3f1698a045c43905e65c228b785
font_01_sfnt_off0000e244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE244 10220 bytes
SHA-256: b1cc7fa67042a81d333a64e65bb81e433293b3daeaf99870b8b7c6b7dc0da42a

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