Malicious PDF — malware analysis report

Static analysis result for SHA-256 f070b39815175f6e…

MALICIOUS

PDF

76.4 KB Created: 2021-01-18 19:59:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: bb5cbd68c0fabc5800716ba659a6fc47 SHA-1: 7d241d5e1a349e1b2e0ee55d1aa8781ea5c8715b SHA-256: f070b39815175f6ec19144b4ab55cf739b928d882890a0937add71ac9b2c0dac
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is designed to lead users to external malicious sites, likely for credential harvesting or further malware delivery.

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://jacksth.ru/123?utm_term=manual+anti+syphon+valve PDF link annotation
    • https://site-1175507.mozfiles.com/files/1175507/dumb_ways_jr_zany_s_hospital.pdfIn PDF document text
    • https://site-1168233.mozfiles.com/files/1168233/chromium_os_arnold_the_bat.pdfIn PDF document text
    • https://site-1177097.mozfiles.com/files/1177097/20441113175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_5f8fccd33cdd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410000/normal_5fdc1218cd631.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459941/normal_5ff1b428c2831.pdfIn PDF document text
    • https://site-1175000.mozfiles.com/files/1175000/lords_of_kingdoms_cheats.pdfIn PDF document text
    • https://site-1177569.mozfiles.com/files/1177569/behavioural_interview_questions_sample_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469630/normal_5faaa758356f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379614/normal_5f8c8848c8c5d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/free_printable_farm_animal_coloring_sheets.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_off0000f007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF007 4976 bytes
SHA-256: f739ee5c826e1b59d1f70f5702cf0fa9365ff31fc40deb01dfc761313fec2eb3
font_01_sfnt_off0001010c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010C 10628 bytes
SHA-256: 24a5ad6bc10a0e7e578fbe0024bdfa612675ac7e1b2758783bbbc6d405610ab0

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