Malicious PDF — malware analysis report

Static analysis result for SHA-256 be23c855f73d691d…

MALICIOUS

PDF

69.9 KB Created: 2021-02-22 15:30:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fd0601fba4a729853fe7e591b7c51c7e SHA-1: b40a85469cac75ea928e706de752fa9a46ef66d2 SHA-256: be23c855f73d691ddf8fff5c7ac4e9a4103ddd17b34d65ad98521105200b5be6
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to potentially malicious or phishing sites, suggesting an attempt to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the document's nature as a link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=t+mobile+personal+cellspot+router+setup PDF link annotation
    • http://jaxaxanukijomel.22web.org/listen_bollywood_music_online_free_without_ing.pdfIn PDF document text
    • http://sivujelofad.22web.org/the_inferno_book_1.pdfIn PDF document text
    • http://obschee.xyz/820793576603ln2r.pdfIn PDF document text
    • http://glawerry.online/naxuxakadazamor6xpt8.pdfIn PDF document text
    • http://juligum.22web.org/14749785070.pdfIn PDF document text
    • http://gefejisu.22web.org/dinesh_chemistry_class_9_free.pdfIn PDF document text
    • http://pesale.pro/boomerang_apk_latestylyya.pdfIn PDF document text
    • http://varnisvakq.ru/rarivesomoxomagigunaghv8jp.pdfIn PDF document text
    • http://bluhgang.best/garabejoguripopenon0ahk.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/xanunafojuloki/48456261555.pdfIn PDF document text
    • http://judewal.rf.gd/benin_gospel_music_audio.pdfIn PDF document text
    • http://noxikemudenuma.epizy.com/15240009944.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/bhootnath_returns_song_pagalworld.pdfIn PDF document text
    • http://mekidojakad.rf.gd/4060544107.pdfIn PDF document text
    • http://garapaf.epizy.com/xofojixotezux.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/53091720683.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/46639493299.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_off0000d342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD342 5168 bytes
SHA-256: 85f57dde130f9ba93f2f30b425eac23a78316b308f77b3c7343e86b4c52fadc9
font_01_sfnt_off0000e4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B2 11196 bytes
SHA-256: 44ecbbbaabeec85895dbf0b1d9a0c072b1fae31bd1035b84ec0d0ed8bd0271e1

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