Malicious PDF — malware analysis report

Static analysis result for SHA-256 657e4fccf3831179…

MALICIOUS

PDF

77.2 KB Created: 2021-06-02 06:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e6dffa40f37ae5624a08ae569a01d292 SHA-1: fa8ca5616b2564465be0e889c770e04114588e38 SHA-256: 657e4fccf38311797b2641e53b0d953c0e37e95b8eda71f03f925b8f23310b1c
206 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier, indicating a phishing or SEO link farm attack. It contains numerous external links, with a significant number pointing to disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to potentially harmful sites. The presence of embedded URLs and the overall structure strongly suggest a malicious intent to distribute or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://cructi.ru/pbw?utm_term=how+to+get+a+subpoena+for+documents PDF link annotation
    • https://kavavori.weebly.com/uploads/1/3/4/0/134012315/4067210.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453344/normal_6062a998c13af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387235/normal_601ab8e6377c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390081/normal_600c9394bea00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386092/normal_5fe64b808724d.pdfIn PDF document text
    • https://mijeridofuba.weebly.com/uploads/1/3/4/6/134677835/jodiwusigev.pdfIn PDF document text
    • https://morurotefat.weebly.com/uploads/1/3/4/3/134317018/20b4d7c5761c764.pdfIn PDF document text
    • https://risenezapaf.weebly.com/uploads/1/3/4/4/134481661/febizul_botoxoxapir.pdfIn PDF document text
    • https://xuwogojike.weebly.com/uploads/1/3/1/3/131380868/zevapifobano-punodolox-nobolunopiri-fixoxebudije.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://sajateves.pbworks.com/w/file/fetch/144441816/the_magician_tarot_card_zodiac_sign.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec49b0e9-16a0-4dab-abdd-2f2cfdd4686d/will_any_wireless_adapter_work_on_xbox_360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/861c7173-2ded-4a38-a690-1e670e51ee20/42382002685.pdfIn PDF document text
    • http://mukonisu.pbworks.com/w/file/fetch/144446796/mimepuwel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/837216d1-fa44-4424-98be-a60cc145c3af/briggs_and_stratton_engine_repair_shops.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a714b4c8-d634-4067-9e31-95b983f390e1/call_me_by_your_name_deutscher_trailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03d2190b-d1af-49ec-ac86-31ef18ce40c6/what_is_a_recapitulation_in_music_theory_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa7ff45c-f1a2-4ac6-a99c-e36842aba032/how_do_i_start_my_toro_snowblower_with_electric_start.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_off0000e3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D7 5468 bytes
SHA-256: 541a4667081221338fa651aa502dc4834c45dc5398b70c42ac765c06e73f5473
font_01_sfnt_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 10324 bytes
SHA-256: fdda27d7c13f0d97b118405c574cca20795ecc07c7b31d290feb50678a760f35
font_02_sfnt_off000119a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A7 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3