Malicious PDF — malware analysis report

Static analysis result for SHA-256 5073ce4fb18820c7…

MALICIOUS

PDF

66.3 KB Created: 2021-03-29 20:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ca84de0719d215bb700f35097fe7d73 SHA-1: 939f585e4da6a44bac42045ab8442746dcca063c SHA-256: 5073ce4fb18820c7423655c71c8294c301f9cad9e80aa050a593633c2525609b
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to a 'translation vector worksheet'. The presence of multiple disposable hosting links and UTM parameters further supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/strik?utm_term=translation+vector+worksheet+tes
    • https://cdn.sqhk.co/zunezafi/2qohgAp/bizajazipu.pdf
    • https://wixurawitubeza.weebly.com/uploads/1/3/4/3/134319602/6995190.pdf
    • http://shopbest.online/3964669016wyqmg.pdf
    • https://wiwojuzikog.weebly.com/uploads/1/3/6/0/136050554/bovupofek_dujavadozu_pijawomexe.pdf
    • https://vominitaxa.weebly.com/uploads/1/3/4/6/134677623/4ca6590cb7.pdf
    • https://static.s123-cdn-static.com/uploads/4417528/normal_5fca96357cc7f.pdf
    • https://cdn-cms.f-static.net/uploads/4386591/normal_602beedb8092a.pdf
    • https://cdn-cms.f-static.net/uploads/4446155/normal_60385c1d6bad8.pdf
    • http://livecopyrightverification.com/understanding_electronics_components_free_download95xth.pdf
    • https://wewowalowumuv.weebly.com/uploads/1/3/4/0/134040384/7844302.pdf
    • https://cdn.sqhk.co/xexisini/cTjdcyd/new_york_and_company_outlet_store_coupons.pdf
    • https://xewidepomizexas.weebly.com/uploads/1/3/0/7/130775014/2804366.pdf
    • https://cdn.sqhk.co/turaxulefa/6tOXhco/just_dance_now_song_list.pdf
    • http://gujozulogisin.scienceontheweb.net/bisection_method_examples_with_solutions.pdf
    • http://file-id.ru/canon_600ex_rt_ii_battery_packnx8oo.pdf
    • https://cdn.sqhk.co/salasereki/yJhh7YN/naxulupobenefigegemu.pdf
    • https://cdn-cms.f-static.net/uploads/4473415/normal_6052a358b6dcc.pdf
    • https://cdn-cms.f-static.net/uploads/4487399/normal_601db8582465a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kabuzore.atwebpages.com/ratner_biomaterials_science.pdf
    • https://uploads.strikinglycdn.com/files/b7b631c8-d97b-40c5-a03a-2941b99e14f6/poulan_pro_chainsaw_chain_brake.pdf
    • https://uploads.strikinglycdn.com/files/24a0c1f9-5414-4ae2-86f2-1f57fb7c1319/fazemiji.pdf
    • https://uploads.strikinglycdn.com/files/684d2ab3-87be-49ec-8ce7-31e6702d86bb/fukabokeka.pdf
    • https://uploads.strikinglycdn.com/files/a2340a68-bc6c-49d8-8c18-0b7a99d1849d/82508596484.pdf
    • https://uploads.strikinglycdn.com/files/6b72ccf2-7e04-4a9c-9cc2-6cd0419613cb/myers_briggs_types.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_off0000c812.bin
23686772851afe680b6c8afc8dcb1b349bf787400eb872b71f8068185c165721		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC812 5052 bytes
font_01_sfnt_off0000d94e.bin
18880ccf8f52091b0de76bf80c81c80ba3d68170afae4a3ec855c376cbfeee94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD94E 10172 bytes

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