Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eca675843b95e3e…

MALICIOUS

PDF

78.8 KB Created: 2021-04-24 19:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4c2421c592819508a8e82c652ddcfa7 SHA-1: 65fddd4641db5236f6eebc3d86ee73e51f00a630 SHA-256: 6eca675843b95e3eb23e065ed72aa91c7356938668d9d4ba164109d68f8d4a03
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, suggesting a link farm or phishing attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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/strik?utm_term=twilight+hindi+dubbed+hd+movie+download+filmyzilla
    • https://kekugijofer.weebly.com/uploads/1/3/5/3/135321092/majobufuleso_wexiwupad_niwasasetiw_kegitagodove.pdf
    • https://pozuzabo.weebly.com/uploads/1/3/4/4/134432083/2f95b968edd.pdf
    • http://topplafond.xyz/bri_mobile_gratis05tf0.pdf
    • http://bonmarket.site/how_to_use_spectra_hands_freetcn4t.pdf
    • http://kebenoda.scienceontheweb.net/vezosetojivefepumuxidifuz.pdf
    • http://es50off.pro/how_to_adjust_valves_on_briggs_and_stratton_12.5_hp_flathead1tb55.pdf
    • https://bozelisu.weebly.com/uploads/1/3/2/6/132695328/a1d2334a417c6cc.pdf
    • http://kernig.store/jimoxofonubqaxc.pdf
    • http://getsol.xyz/fonudiwowowajaxiniwaxivhnie.pdf
    • http://lnstagramcopyrightmanagement.com/how_to_bypass_adt_zonenydd4.pdf
    • https://makifilibavik.weebly.com/uploads/1/3/5/3/135383918/0c9ade5.pdf
    • https://pibezenasa.weebly.com/uploads/1/3/1/4/131454503/duvobatutaba-faxaven-mamavasarib-gowavupevan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kewevagisugimuw.onlinewebshop.net/wuvawag.pdf
    • https://60883313-e483-4213-bdf2-3844198a3b35.filesusr.com/ugd/3ba96b_448d02471e8e4bc4931f747959fc317e.pdf?index=true
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_50aeff7368584fb8aeae8b839daee50b.pdf?index=true
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_489593961ba94046b7b0483f6a60f8b3.pdf?index=true
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_8519ff4d88534a1381f89274d4485d07.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6ae.bin
0c57e5b0aef98b8af81c0cb98cc9801942b7ec7e4f6c2034e24dd94107cdb751		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AE 5440 bytes
font_01_sfnt_off00010932.bin
b3cd5ed3eb9df710a29b1a64a3cff50c335befbc39074218399006d4b68d7f80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10932 10776 bytes

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