Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa13d976bf5faf7…

MALICIOUS

PDF

94.8 KB Created: 2021-03-12 10:59:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a601f7ac93c22b0bc26c5a621d468bc6 SHA-1: 52814579209d1cf0b441f74e2a05cc9e07308a9c SHA-256: 1fa13d976bf5faf729dcff02a2b9bc9d9e4b6953722fb798ea2b4c699a5b2c6c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking documents, but one primary link to 'xezojetit.ru' is suspicious. The ML classifier and ClamAV strongly indicate maliciousness, likely related to phishing or malware distribution. The document body text, though garbled, appears to be a lure related to sheet music, which is likely a deceptive pretext to encourage clicks on the embedded malicious URL.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/123?utm_term=bassoon+solo+sheet+music+free
    • http://pizolejotana.22web.org/farming_simulator_15_money_cheat_mac.pdf
    • http://ruvikuvi.mywebcommunity.org/linadizuruw.pdf
    • http://tivewuba.iblogger.org/what_natural_ingredient_kills_toenail_fungus.pdf
    • http://dakajak.medianewsonline.com/curva_de_crecimiento_bacteriano_microbiologia.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/bbc3e2a9-497a-42dc-8079-c8b1c017a958/81361539158.pdf
    • http://worined.epizy.com/acorn_120_stairlift_installation_manual.pdf
    • https://uploads.strikinglycdn.com/files/176a2d76-0774-4514-ae34-f1c0c5f51838/tabujoberuleri.pdf
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_ab6fcae40e8143ac98588d3c34f55ad7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a9d82739-a37a-46d7-8288-6b4f00696677/3861332340.pdf
    • https://uploads.strikinglycdn.com/files/6eb9fed5-5109-4354-8e1e-2931fc11b937/bibatudafoxima.pdf
    • http://sabixukavizom.myartsonline.com/ketexuri.pdf
    • http://zisunajupanege.rf.gd/62114229640.pdf
    • https://uploads.strikinglycdn.com/files/0d53be1a-bdcc-4fb2-ad29-e6b25ca56af7/16425259260.pdf
    • http://fibogexexagiram.rf.gd/laundry_care_label_symbols.pdf
    • https://uploads.strikinglycdn.com/files/2d87ef3b-433c-4462-8278-3f879aba83e9/riredudetajarerar.pdf
    • https://uploads.strikinglycdn.com/files/370e0972-596c-40ae-a58d-d274ca5f99bc/beats_studio_wireless_4.pdf
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_ce7d03b67869439190b89d06e38855fa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/117e4935-a61c-48b8-869f-f0958a685667/zarozebaxasajiwe.pdf
    • https://uploads.strikinglycdn.com/files/44663c5c-1f81-41e3-b979-65a01e5a6d8d/what_are_the_functions_of_a_security_guard.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_off00012806.bin
46a78dac20401d77756eab883d561593fea707e3bcf99c2573944b26569d932c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12806 5052 bytes
font_01_sfnt_off000138fd.bin
1d037b68f1616ce080adb23fb7840b0dbec188257e70e3a388355adc00dedadd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138FD 12448 bytes
font_02_sfnt_off00016007.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16007 4324 bytes

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