Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9fcce0090f3de22…

MALICIOUS

PDF

83.6 KB Created: 2021-02-27 01:12:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f3cc57f52fe85270056185327a0f3501 SHA-1: d656517e566b4a6e0d4d0fe687eca6422899ae9a SHA-256: c9fcce0090f3de22194eb13cecd6d8e9f29f612fb30bacb61fd0853b79f5263e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to operating systems, likely a pretext to encourage clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=%25C2%25BFcu%25C3%25A1les+son+los+tipos+de+sistemas+operativos+y+sus+funciones PDF link annotation
    • https://cdn.sqhk.co/tafolaku/hHTifBL/university_of_montana_missoula_jobs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444649/normal_6037d3e74dcd0.pdfIn PDF document text
    • http://bazodifufibi.22web.org/resadojosajazesukobovo.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/will_star_citizen_be_on_xbox_one.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386597/normal_6037fb4b45bd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472753/normal_602734e0e6b7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365601/normal_5ffca09489dd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374700/normal_600245f428f03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498330/normal_602f149a3a083.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/ihhDggN/43756035034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370275/normal_60138d66dc3bb.pdfIn PDF document text
    • https://cdn.sqhk.co/limexofure/LxxghTi/71006531979.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojijejip/uYjj5hg/only_one_you_fish_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455669/normal_60350fd0a285f.pdfIn PDF document text
    • https://cdn.sqhk.co/jakibefivi/dyiiihW/rubakomabowawetudutotug.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/what_is_gothic_art_characteristics.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/rafozogiduzuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zilowovuv.atwebpages.com/gaxugujetanuriwigivukem.pdfIn PDF document text
    • http://zovaner.rf.gd/94272755434.pdfIn PDF document text
    • http://jofosomorigifo.rf.gd/latest_bittorrent_filehippo.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_off000103c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C0 5740 bytes
SHA-256: 7557ca5483c62686c9174a0e3f6f4f7ef6831f642b025f9643684f0b45aedc2c
font_01_sfnt_off000116af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AF 11984 bytes
SHA-256: 6b55a925935247cd43cdd58d0de56fbeca01ad9efa4af955b53b0790d4e5ded7

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