Malicious PDF — malware analysis report

Static analysis result for SHA-256 22fa69ea4c39a5a2…

MALICIOUS

PDF

78.9 KB Created: 2021-03-27 18:53:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 731226a3b88e7b5742626937c6b63e3e SHA-1: 7c00beee01ba8c9afdf930de291913f9fd85202e SHA-256: 22fa69ea4c39a5a230dc2d93a3a46dc64043c65e79326e6f34514ec88922b0a5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism. The primary URL, https://seumenha.ru/wix?keyword=madeira+a-2+acoustic+guitar, is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=madeira+a-2+acoustic+guitar
    • http://wamawebikojas.22web.org/mugagax.pdf
    • http://siankaanmexico.com/prince2_agile_foundation2kjy9.pdf
    • http://thecet.xyz/34590944917q3teh.pdf
    • http://biolinkus.me/lenovo_t430_lan_drivers_windows_7_64_bitfhrlg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8b943417-7e00-40e9-9365-59b384606137/rilanevo.pdf
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_377869f894144595bfec3663f1565c06.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5cdb0fa9-3f8f-43c1-9e37-25a11211518b/67903420616.pdf
    • http://baguselewaz.epizy.com/niketakalafirarufabusuwuz.pdf
    • https://uploads.strikinglycdn.com/files/44dcd6c1-0a0b-495b-b9e4-69a6f3eef853/fallout_4_mods_pc_steam.pdf
    • https://96ea5dd8-6962-4d57-b29c-fb233a715e3b.filesusr.com/ugd/ac3463_edc11da3faf8414b9b8fbc59c5192cb0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ba8bb881-ddca-40e1-abbb-740bd1bb2032/how_many_calories_in_1_bob_evans_sausage_patty.pdf
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_9fd42f6fccc240c68df4244aa7e87de9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4b6a5901-9876-45eb-b7f2-e36a38f63938/93328257148.pdf
    • https://uploads.strikinglycdn.com/files/767c3b08-8779-4221-bb6d-94a480bae206/how_to_get_probability_distribution_in_excel.pdf
    • https://uploads.strikinglycdn.com/files/d2c9060c-f625-46d2-90fd-9548974dee5f/bam_bas_bat_bamus_batis_bant_translation.pdf
    • https://uploads.strikinglycdn.com/files/ed1edcb3-f66b-4dc7-8286-cfaf57228b0f/30874133493.pdf
    • http://zorijofoxafa.epizy.com/prentice_hall_physical_science_textbook_answers.pdf
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_48db8cc027654246b350a5f73fda854e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f37b6ab0-ba3f-4a4b-b5ed-547df25cbd2d/xinadogedojumezip.pdf
    • http://kunaraxanoxun.epizy.com/xiritime.pdf
    • http://vufufule.epizy.com/53160226313.pdf
    • https://uploads.strikinglycdn.com/files/dcd691ea-406b-4292-bdc5-06391062f2d2/1001_songs_you_must_hear_before_you_die_2019.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f719.bin
23c70127241306c8e0159f99ac117e037f51fe046d1acfa0594547fe5f86f304		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF719 5244 bytes
font_01_sfnt_off00010910.bin
e1795092782312f326cab6eba34d9a3ab1eb67f33e03f85d44c45d575b254dfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 11032 bytes

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