Malicious PDF — malware analysis report

Static analysis result for SHA-256 100b1fef6d4056b2…

MALICIOUS

PDF

74.3 KB Created: 2021-03-05 05:41:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 12060b7e8d7ada2a3ec25c4e02e59813 SHA-1: 4ca5676c3e782b3925104511ec7e142ae14f93ff SHA-256: 100b1fef6d4056b22e646b2dac57b93f4c5e596ee7b86179a9664ff6ffac2474
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/strik?utm_term=model+3+range+options PDF link annotation
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/joxaketopuxomopifo.pdfIn PDF document text
    • https://xapeposatu.weebly.com/uploads/1/3/1/4/131437079/vewudomikozet_zederuxajeb_lakamun.pdfIn PDF document text
    • https://faworufobideped.weebly.com/uploads/1/3/2/6/132682851/6140194.pdfIn PDF document text
    • https://rolurenogilu.weebly.com/uploads/1/3/4/0/134096536/f826e9.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/segominaros.pdfIn PDF document text
    • https://sijudunewofas.weebly.com/uploads/1/3/4/6/134696620/3107087.pdfIn PDF document text
    • https://guwawafike.weebly.com/uploads/1/3/5/3/135338161/wanitezafaxubawulizi.pdfIn PDF document text
    • http://kepukarob.sportsontheweb.net/how_to_repair_your_whole_body.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/1915986.pdfIn PDF document text
    • https://nodokesomizi.weebly.com/uploads/1/3/4/6/134656280/vaxuzawimuwep.pdfIn PDF document text
    • https://mokenexub.weebly.com/uploads/1/3/4/4/134478104/7397062.pdfIn PDF document text
    • https://kakabotosor.weebly.com/uploads/1/3/0/7/130775724/kifuxubal_mavaga.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/lifetime_fitness_la_jolla_membership_cost.pdfIn PDF document text
    • https://barijimuje.weebly.com/uploads/1/3/1/4/131406344/1f789d.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/db277fb4-2d83-410a-9ab1-fdd740ee211a/how_to_make_crochet_blanket_edges_straight.pdfIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_8a7fe0c639104eb3bbb153d4637809f9.pdf?index=trueIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_dd3b746433e04b348dc3504954e7ad02.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c605b4a8-9471-41ef-9fba-0b967139aa62/what_is_the_mechanical_advantage_of_a_halligan_bar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71c31679-992e-495b-b265-6602b8080544/gopuvunag.pdfIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_eeb11a8aa36d4354bb8c5c603f21ac5b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a6b8dee-bf6f-42f9-82c7-613ff0a8cdad/stream_the_time_travelers_wife_online_free.pdfIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_f5bba0a10c2d4ad090eac15cbf9b74d1.pdf?index=trueIn PDF document text
    • http://tiwosutodegadax.onlinewebshop.net/how_much_do_automotive_engineers_make.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_off0000e583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE583 5296 bytes
SHA-256: f1e7bfd74328dd52af9b1e5d6dc6fb86879efe9532618d3546e4972f362d897b
font_01_sfnt_off0000f7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 10700 bytes
SHA-256: b9ddb29be2174a409d6cf7f23ec692e8eb02dcf647b843e386a44ae804703d94

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