Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3792f04cdf4f0d…

MALICIOUS

PDF

73.2 KB Created: 2021-03-06 03:40:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 994f884503fbf4365bcf95e73eaa9369 SHA-1: c2141bbb264965cd1578c4ecbac29083e3c45cb9 SHA-256: aa3792f04cdf4f0de8d72add5da7b94fcdc68b5937bb3ff0b119e01a957a9ed1
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically appearing as a search result for 'John raynes human anatomy for the artist pdf' leading to a suspicious domain. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host many links on disposable domains, further supporting a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and URL patterns point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://xajibur.ru/123?utm_term=john+raynes+human+anatomy+for+the+artist+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416125/normal_5ff7082c18686.pdfIn PDF document text
    • https://menajogatidufe.weebly.com/uploads/1/3/0/7/130740573/2669801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387243/normal_601932faa8c06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495400/normal_6038bbc59761f.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/hdIbUia/66329229042.pdfIn PDF document text
    • http://reduslim-eu.site/what_is_the_best_upright_freezer_to_buyutsok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476443/normal_5fd5fb2e8eb99.pdfIn PDF document text
    • http://krokoboko6.xyz/what_is_the_code_for_a_panasonic_tv_universal_remote923vy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489980/normal_6037470ba3f14.pdfIn PDF document text
    • http://inter-kalinka.ru/3319624347798rwo.pdfIn PDF document text
    • http://prizinsta.info/asp._net_mvc_ajax_post_form_serialize4u8rh.pdfIn PDF document text
    • https://cdn.sqhk.co/fasisela/rxjdjiX/wabegonesudozo.pdfIn PDF document text
    • http://outputqwvk.space/wuvubolabivonipakotuvebiphw0os.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443337/normal_5ff979148f317.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487658/normal_5fdf044372e06.pdfIn PDF document text
    • https://danodukuwen.weebly.com/uploads/1/3/1/6/131637043/5211092.pdfIn PDF document text
    • https://wobanuwu.weebly.com/uploads/1/3/5/9/135959505/savelukividibud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493545/normal_5fdeda3493bfd.pdfIn PDF document text
    • https://fudixiboronis.weebly.com/uploads/1/3/4/3/134322082/pawumagaduw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bace892-a3c6-469a-a2dc-c7c735932290/how_to_check_solenoid_on_ezgo_golf_cart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ee8288-a02d-41ca-892b-9289de09028c/tecknet_keyboard_not_connecting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42c3a913-07af-457b-9424-074155791e33/nefezoboxozilenotunevivel.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 5340 bytes
SHA-256: 3987db00e57c6ee4510b8d4b2f30eafa47e1c44a5f57895c7cf736a134698a88
font_01_sfnt_off0000f35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35A 10468 bytes
SHA-256: da46a39fa2a852f69ea4420fb86737f03dbb881cd54b8955ca28a3401164c722

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