Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57f1dd558eb2f47…

MALICIOUS

PDF

73.7 KB Created: 2021-02-16 19:06:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b27c24486dde8893946be123d9d5edf8 SHA-1: 2933d543f4e6c4a1ff64a1a51c64200722ec594f SHA-256: c57f1dd558eb2f479d5e2bb3a5ad2db359b0150b9ebc1777fd5c13c29fb1c075
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam tactic to drive traffic to malicious sites. The embedded content, though heavily obfuscated, likely serves to facilitate the redirection to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://jottigo.ru/strik?utm_term=dark+tower+tv+series+news PDF link annotation
    • https://bunupujitoj.weebly.com/uploads/1/3/4/0/134017728/1086476.pdfIn PDF document text
    • https://zoxujaratufopa.weebly.com/uploads/1/3/5/3/135399722/358d34b.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/6749270.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/mggQhh6/bike_stunt_game_tricky_bike_racing.pdfIn PDF document text
    • https://danikobunib.weebly.com/uploads/1/3/4/7/134755608/nanizosipini.pdfIn PDF document text
    • https://wigadanoj.weebly.com/uploads/1/3/4/4/134404864/jebebijazu.pdfIn PDF document text
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/vuxamudoribo_titoperij_panulo.pdfIn PDF document text
    • http://stopnutristrike.ru/twitter_search_people_s_tweetsugcg6.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/gitrgeU/hebrew_word_for_master_builder.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/gJii1HR/grand_theft_auto_5_gun_cheats_xbox_one.pdfIn PDF document text
    • https://dadojunolibete.weebly.com/uploads/1/3/2/6/132683289/xurezozebisurasebuki.pdfIn PDF document text
    • https://dinurafilaxu.weebly.com/uploads/1/3/4/6/134621410/c52fd2.pdfIn PDF document text
    • https://cdn.sqhk.co/lizupasepafu/hhhcjgm/8727791155.pdfIn PDF document text
    • https://gixakipero.weebly.com/uploads/1/3/1/4/131412713/8845867.pdfIn PDF document text
    • https://finukapaxareb.weebly.com/uploads/1/3/4/4/134494590/e4acdc.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
    • https://s3.amazonaws.com/folexapurilowe/belafonte_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/2909403329.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_off0000d58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58A 4652 bytes
SHA-256: b2f72bd4dcb108620a91173716545c007dc514ded5c38fb3affe0e3a6c8d7afa
font_01_sfnt_off0000e57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57F 11464 bytes
SHA-256: f00b16224031689a8e0f666525c0b81a8e0d3bd1272257f8c5534bd7a2bc5d93
font_02_sfnt_off00010bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC6 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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