Malicious PDF — malware analysis report

Static analysis result for SHA-256 682b7b5552802a34…

MALICIOUS

PDF

81.6 KB Created: 2021-03-17 22:52:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8ca1ccc9c3d74ea29b507ca0fd373bff SHA-1: e9ff7e200d0860aac6cd1863b4dbff323570bd2a SHA-256: 682b7b5552802a3410e63c57ce5afe1ca5a9e0eb3b459b2f3a4665653bd1e972
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm designed to redirect users to potentially harmful websites. The document's apparent purpose is to deceive users into clicking these links by masquerading as a technical document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/aws?utm_term=2006+toyota+camry+stereo+wiring+diagram PDF link annotation
    • https://cdn.sqhk.co/sotisajen/1Khhjhp/texas_parks_with_cabins.pdfIn PDF document text
    • https://cdn.sqhk.co/didowolikex/YFdgchc/33167754712.pdfIn PDF document text
    • https://cdn.sqhk.co/tokafumotebi/5Ejhgif/69626802649.pdfIn PDF document text
    • https://towutibe.weebly.com/uploads/1/3/4/0/134012467/zanalikurin-lanivef-xopabaxubav-jaxezadananinix.pdfIn PDF document text
    • https://cdn.sqhk.co/xobanozizesa/U5jaVjd/the_diplomat_boutique_hotel_merida_mexico.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/dYqwAG6/femiseki.pdfIn PDF document text
    • https://cdn.sqhk.co/porekige/4ijighf/win_98_simulator_apk_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/budatumibowu/PI9ibPf/66761622139.pdfIn PDF document text
    • http://fakurivevid.scienceontheweb.net/r_programming_language_crash_course.pdfIn PDF document text
    • https://jukorupojos.weebly.com/uploads/1/3/5/3/135344641/2491736.pdfIn PDF document text
    • https://viduxetejogat.weebly.com/uploads/1/3/4/6/134600114/kewogakosiwafigup.pdfIn PDF document text
    • https://cdn.sqhk.co/niwonosorude/bjgBTiS/mosquito_sound_deterrent_device.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_7f50cc073cbb4520b00068fdc5e80b51.pdf?index=trueIn PDF document text
    • http://naluliwuv.epizy.com/what_is_the_best_whirlpool_washing_machine_to_buy.pdfIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_d6b5965f7502494db7709c02ae0fc2f2.pdf?index=trueIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_b652b4a644954463853bee618f911240.pdf?index=trueIn PDF document text
    • https://933e9900-fbdf-42a6-9ede-b5fb8444937c.filesusr.com/ugd/3254bf_5dd6498b2399456faa81768dc47e92a5.pdf?index=trueIn PDF document text
    • http://sijomawawu.epizy.com/bankruptcy_reform_act_of_1978.pdfIn PDF document text
    • http://kavuduvolilazod.myartsonline.com/wowuxoverazotoxiwomoli.pdfIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_09f12b6bc5e54cafaef23b692c31a9b9.pdf?index=trueIn 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_off000100bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 5752 bytes
SHA-256: 8d9051b74c9d26a220c457b23c5233f97a8a6528a1dc1358009a3de2b9ee6dc6
font_01_sfnt_off00011452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11452 10732 bytes
SHA-256: 4fb3ee234d69e1968ff26376b791f0fd0d82f059603c6a3f89e51e26c5ecdafb