Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c6c015631a266f…

MALICIOUS

PDF

75.6 KB Created: 2021-03-08 21:33:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: c0ec998dc83c56c223844c132284522b SHA-1: 20fa05e20656ae6c10639f0876986a1cd8efa5a4 SHA-256: 79c6c015631a266fb325ef19e6468cf14fb219e85791bbf4156e73ab75cdfb83
66 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which are hosted on disposable domains and appear to be part of a link farm. The document body, though partially corrupted, suggests a lure related to software installation. The ML classifier strongly indicates maliciousness, and the presence of external URIs points towards redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://midufefew.ru/strik?utm_term=how+to+install+disney+plus+on+2014+samsung+smart+tv PDF link annotation
    • http://nurokojo.mypressonline.com/are_jelly_beans_ok_for_dogs.pdfIn PDF document text
    • https://daxeteven.weebly.com/uploads/1/3/2/8/132814811/5207850.pdfIn PDF document text
    • https://mesasijodise.weebly.com/uploads/1/3/5/3/135315214/dikiju-buvorogaxofuger-bekebigebuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468823/normal_5ffff3d61b6c5.pdfIn PDF document text
    • https://cdn.sqhk.co/tipusuzog/ftcA8ZH/text_generator_with_emojis.pdfIn PDF document text
    • http://fakts.design/yamaha_cx-_a5100_manualesokmm.pdfIn PDF document text
    • http://cafechorsu.ru/soluciones_matematicas_1_bachilleratxa67n.pdfIn PDF document text
    • https://raragunaxunu.weebly.com/uploads/1/3/4/8/134886293/xatoboxaxeluzawadad.pdfIn PDF document text
    • http://jofipifemu.medianewsonline.com/digital_economy_act_2010.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/analisis_del_libro_la_tregua_de_mario_benedetti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454559/normal_602a4fe800e4b.pdfIn PDF document text
    • http://gidpopiteru.com/murebizebolupemeropo4imwy.pdfIn PDF document text
    • http://wisecreditscore.info/bot_liker_appicl7m.pdfIn PDF document text
    • http://whowill.ru/7th_grade_sentence_examplesfsyqx.pdfIn PDF document text
    • https://taxonegumogel.weebly.com/uploads/1/3/5/3/135330056/9d809283e211.pdfIn PDF document text
    • http://wekanisa.scienceontheweb.net/nuvimel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495858/normal_60085e35c1a0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413968/normal_5ffe8ea61ca25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383692/normal_60314808bebfc.pdfIn PDF document text
    • https://cdn.sqhk.co/dexasubu/aMmpghA/fodige.pdfIn PDF document text
    • https://cdn.sqhk.co/gevajoke/gjLieqK/monster_evolution_hit_and_smash.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D1 5908 bytes
SHA-256: 586c81a7734e7e907ad8764862bbd10d92ff5730787be0ee71c8d1bd5ca596b6
font_01_sfnt_off0000fdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 10128 bytes
SHA-256: 414ccca0efc327e49d27d620a9a9243ff27656b6d019f80b87c626134b2fc2ae

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