Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af6529917028c38…

MALICIOUS

PDF

69.2 KB Created: 2021-02-13 11:57:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 69424cfdd37562baaf00fde3176a7953 SHA-1: 20dc1d53230bf5dfb55cef81f54df502433f2d1a SHA-256: 4af6529917028c3851c281540d7ce485eb8ab2ce3ae032234b9251ba9c159370
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, suggests a lure related to an 'injury report', and the presence of numerous external links, including one to 'jacksth.ru', points towards a phishing or link-farming attack pattern. The PDF structure itself contains multiple embedded links, further supporting this.

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://jacksth.ru/aws?utm_term=jax+jaguars+injury+report PDF link annotation
    • http://xenotobewaf.22web.org/goneluzirunak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385216/normal_5fda2061b5169.pdfIn PDF document text
    • http://gaturemani.22web.org/ny_times_crossword_answers_today.pdfIn PDF document text
    • https://cdn.sqhk.co/kenipafitu/gh0Rmgd/32797605672.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451753/normal_5ff56af26a0ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494888/normal_5fd3a19cbac42.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/iehfxtg/71636531575.pdfIn PDF document text
    • https://cdn.sqhk.co/wesaduleb/EKHJjjD/zig_zag_knitting_pattern_afghan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458840/normal_60271bbfa045d.pdfIn PDF document text
    • https://cdn.sqhk.co/vidikusupegu/Dcrhf9r/new_zealand_jet_boat_racing_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370785/normal_5ff9a52133d1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446286/normal_5fe4008080433.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kalotiwinilobiw.epizy.com/talonunotebufoxipigo.pdfIn PDF document text
    • http://vezoxonu.epizy.com/zaferixum.pdfIn PDF document text
    • http://rapuzivawa.epizy.com/hardest_bible_questions_and_answers.pdfIn PDF document text
    • http://lovopezabima.epizy.com/jumble_answers_9-_20-_19.pdfIn PDF document text
    • http://kewivifonawati.epizy.com/spider_man_2_apk_ppsspp.pdfIn PDF document text
    • http://popewap.epizy.com/manual_da_camera_nikon_d3200.pdfIn PDF document text
    • http://xetatiwu.rf.gd/9977284208.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_off0000cfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE5 5192 bytes
SHA-256: 9e847f10bb79d3147f16739a7ce6468c0a9e34f6755610c143c6d01e74527aa7
font_01_sfnt_off0000e1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B8 11224 bytes
SHA-256: 04b3600c6a7ecc396d3300230ca9b4f46654a5cee5cf6ea3625e98dd7e90f648

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