Malicious PDF — malware analysis report

Static analysis result for SHA-256 8654f585ac7b546b…

MALICIOUS

PDF

77.2 KB Created: 2021-06-07 09:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21704834860dd6fe7727e6ee727ea9b8 SHA-1: 50a2471ff1d83041a7909d847c974b24d94cd77e SHA-256: 8654f585ac7b546b52e03191bdc5acebb3a5c23d385bc6abe996666292b7b899
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, a technique often used in SEO link farms to manipulate search engine rankings or to distribute malicious content. One prominent URL, 'https://crysiq.ru/pbw?utm_term=archero+mod+apk+unlimited+money+1.3.4+download', suggests a lure related to downloading modified application packages. While no scripts were explicitly extracted, the PDF structure and the presence of external links strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://crysiq.ru/pbw?utm_term=archero+mod+apk+unlimited+money+1.3.4+download
    • https://cdn-cms.f-static.net/uploads/4366965/normal_60325cb2ad94e.pdf
    • https://gomisixazu.weebly.com/uploads/1/3/1/4/131437427/4810300.pdf
    • https://cdn-cms.f-static.net/uploads/4449193/normal_601ef6e6d2d23.pdf
    • https://vomenipof.weebly.com/uploads/1/3/4/5/134585177/ragonav.pdf
    • https://moganuvutixeku.weebly.com/uploads/1/3/1/1/131163890/xotogesirufomup.pdf
    • https://bixemasabomevis.weebly.com/uploads/1/3/4/5/134517571/b2fc7c5847696c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/15c7cc08-62da-4674-80ea-037c09d29b51/how_to_descale_krups_coffee_maker.pdf
    • https://uploads.strikinglycdn.com/files/48599107-70d4-489f-8e6e-e792887704f1/gazijekowogu.pdf
    • https://uploads.strikinglycdn.com/files/ec5bdb13-522e-4f83-bffe-1091d3146a50/converter_video_movie_maker_para_mp3_online.pdf
    • https://uploads.strikinglycdn.com/files/e34b84e9-ebc0-4291-b4f7-d241a470f9ea/resumen_del_libro_cazadores_de_microbios_capitulo_10.pdf
    • https://uploads.strikinglycdn.com/files/5a3db7f0-ade6-4587-bca8-2bb4ccc309e8/89551879938.pdf
    • https://uploads.strikinglycdn.com/files/8540826d-ba8c-4de1-bff5-f8a03e35efcd/healing_for_damaged_emotions_book_review.pdf
    • https://uploads.strikinglycdn.com/files/c9c64b8d-4e75-489c-8ce2-7ddbc2a732ae/what_are_the_purpose_of_technical_report_writing.pdf
    • https://uploads.strikinglycdn.com/files/6fe07831-09e1-4677-8952-3edda2259edd/how_to_use_a_heat_press_with_cricut_vinyl.pdf
    • https://uploads.strikinglycdn.com/files/56e3e2ee-e9f5-4ed6-9189-5637b4bb64dc/12683999300.pdf
    • https://uploads.strikinglycdn.com/files/ea761f0b-9c82-407d-89c1-70079569d990/pioneer_avh-x3600bhs_wiring_harness_diagram.pdf
    • https://uploads.strikinglycdn.com/files/165157b3-dc9b-4cb3-ad75-5e6b134d8529/elif_temporada_4_en_espaol_capitulos_completos_dailymotion_817.pdf
    • https://uploads.strikinglycdn.com/files/9a417378-1f7a-4049-a4f9-06bc616ed44a/65974063551.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e13c.bin
dafe397d5062bf8370f05425cb70be0cc3311621190d9b90cbf17f8c7b18ae49
pdf-font-stream PDF embedded font (sfnt) at offset 0xE13C 5600 bytes
font_01_sfnt_off0000f43a.bin
d6bc6a988b0aed5685b595795b21c1ac663a4aef054ec2e1cc3c3d505b3e57e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF43A 11256 bytes
font_02_sfnt_off00011913.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11913 4324 bytes