Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b64e753476c2fc8…

MALICIOUS

PDF

169.6 KB Created: 2021-01-18 03:05:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4b32d632302f6b18cc39d43189d6e0aa SHA-1: c1f8b2c292c89020ae825bbb5fc5d5d46772c597 SHA-256: 4b64e753476c2fc86875a67d1533dfad847945906b428828c34981575e36261d
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these numerous external links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffi.ru/123?utm_term=vocabulary+warm-up+exercises+answers+key PDF link annotation
    • https://cdn.sqhk.co/tubadaluzafu/hjxigjb/60282195926.pdfIn PDF document text
    • https://site-1168172.mozfiles.com/files/1168172/56914089668.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/nijulavoniret.pdfIn PDF document text
    • https://site-1176636.mozfiles.com/files/1176636/train_sim_world_2_xbox_one_controls.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/GQhdOhh/the_lobby_elizabeth_nj_parking.pdfIn PDF document text
    • https://cdn.sqhk.co/vivutazawi/ixnjeic/pilot_mountain_middle_school_lunch_menu.pdfIn PDF document text
    • https://site-1172508.mozfiles.com/files/1172508/6503879138.pdfIn PDF document text
    • https://site-1178153.mozfiles.com/files/1178153/netflix_price_per_month_increase.pdfIn PDF document text
    • https://tofujifudaxibav.weebly.com/uploads/1/3/5/3/135326414/da1dfd862e59c.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/xDjfMje/talifi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464851/normal_5fc99a4ad7e47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468871/normal_5fc0cf32111c9.pdfIn PDF document text
    • https://site-1166600.mozfiles.com/files/1166600/31199472659.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jopivot.rf.gd/50959362832.pdfIn PDF document text
    • http://varepekolati.rf.gd/20693041260.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_off00025eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25EB1 5540 bytes
SHA-256: 4b0818a23dd076128c35f02d7b80405c93a85aac5041af17ca9692cbd0821c03
font_01_sfnt_off00027197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27197 11892 bytes
SHA-256: 5c3b935906c09fb35fb225d4d363860ad4c98416488313d5c9f3215a6946681a

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