Malicious PDF — malware analysis report

Static analysis result for SHA-256 99eb855cd2d39624…

MALICIOUS

PDF

103.3 KB Created: 2021-03-09 22:46:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 88c6f384a2ff4d6a24ab09f354d0b5bb SHA-1: 94f9cad30d4110c70bb73a0e94fdd78846425c15 SHA-256: 99eb855cd2d396247ecd6cdb4213be8b81249b21ed3e1a62496d223def317341
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains text related to a 'Reebok basketball hoop parts list', suggesting a lure to disguise malicious links. The presence of many distinct hosts and links indicates a link farm designed for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=reebok+basketball+hoop+parts+list PDF link annotation
    • https://cdn.sqhk.co/sugefixa/iiidjhc/cookie_crush_game.pdfIn PDF document text
    • https://xajapimiwumorav.weebly.com/uploads/1/3/0/7/130739235/c63b5534b3e0b14.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/immanuel_kant_philosophy_of_self.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/celosia_argentea_medicinal_uses.pdfIn PDF document text
    • http://wurilozi.scienceontheweb.net/best_pimp_rappers.pdfIn PDF document text
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/6719752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389616/normal_601aa49f68b1c.pdfIn PDF document text
    • https://cdn.sqhk.co/woberimi/jjhjcib/versatile_life_meaning_in_urdu.pdfIn PDF document text
    • http://xutefizil.getenjoyment.net/how_to_hand_to_hand_combat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466680/normal_601981f644a03.pdfIn PDF document text
    • http://nesegejisivinu.medianewsonline.com/old_school_rectangle_pizza_recipe.pdfIn PDF document text
    • https://vexuzunudupugez.weebly.com/uploads/1/3/0/7/130740013/42cde543a99.pdfIn PDF document text
    • http://gimerixifaxet.iblogger.org/22406595182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385631/normal_603b9e8c7c9cb.pdfIn PDF document text
    • https://cdn.sqhk.co/zezegawutogu/egdDxje/how_to_make_slime_crystal_tinkers_construct.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450040/normal_5ff0cdeb2a8e5.pdfIn PDF document text
    • https://cdn.sqhk.co/nadetajagupe/5tjcgjE/stickman_war_zombie_attack_survival_games_ps4.pdfIn PDF document text
    • https://vovavurag.weebly.com/uploads/1/3/0/7/130739927/sisujeneja.pdfIn PDF document text
    • https://vipuwajaziw.weebly.com/uploads/1/3/5/3/135398090/c58100d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vamudijikepefos.rf.gd/super_smash_inkling_guide.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000136e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E0 5120 bytes
SHA-256: 50e992966b45e04761027ea18f2aef51d62a1b5d25eb733a851cd9a5acc18264
font_01_sfnt_off00014842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14842 15888 bytes
SHA-256: f9b4e25eb49845a33b1f46a4c1d6716b3cfd10527993a090cef1d4e9f867bf32
font_02_sfnt_off00017974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17974 16344 bytes
SHA-256: 43c26abaad7a669a27ef13a89ce1ebe72cd6f32188ca694eb889e69fd9f3b786

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