Malicious PDF — malware analysis report

Static analysis result for SHA-256 a331b66324774409…

MALICIOUS

PDF

79.7 KB Created: 2021-02-17 00:36:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0ec6286366cc8dc17b10071760d9d3e9 SHA-1: 6270708cdb81f8185420058374e85727b7adcfa9 SHA-256: a331b663247744099c5e8d5ddbd50b433444a4f3db1b37f2e145178ecf93430e
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of numerous links suggests a phishing or malware distribution lure, likely leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=2012+ap+calculus+ab+multiple+choice+part+b In PDF document text
    • https://cdn.sqhk.co/mujexoxa/rmaJUgf/66214910912.pdfIn PDF document text
    • http://sidazolomaw.22web.org/watch_hunger_games_catching_fire_online_free_gomovies.pdfIn PDF document text
    • http://bupomorefa.22web.org/dragon_age_origins_leliana_approval_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/doxowite/cZqhahZ/40625505773.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/ZByA3ic/woodworkers_hardware_sauk_rapids_mn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417032/normal_6000515987af7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495244/normal_600489f0ca993.pdfIn PDF document text
    • https://cdn.sqhk.co/rawewosit/dghifjb/xagevuxusapuxewakuzuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://robexekipojop.rf.gd/bellevue_washington_weather_report.pdfIn PDF document text
    • http://pixuxurarosu.epizy.com/big_ideas_learning_algebra_2_performance_task.pdfIn PDF document text
    • http://posazexemonepen.rf.gd/azurine_uhc_texture_pack.pdfIn PDF document text
    • http://pubitawiwinas.rf.gd/how_to_network_marketing_in_hindi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A3 5320 bytes
SHA-256: 6886d8cbde2b2ca98f317112842240211f6e3780a4bbbb3ccae5180f8774ea6b
font_01_sfnt_off0000f3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A9 15084 bytes
SHA-256: 7f54a6ca5e62035703f94b96acf050b25a74fedc1e3cb73170523bf471a6524d
font_02_sfnt_off00012380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12380 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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