Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ebbef85bed0cc9…

MALICIOUS

PDF

88.0 KB Created: 2021-03-12 16:13:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ad5338c254d41e0cd3930ad056f4c734 SHA-1: b5dfa39c26d6630690d4f242c5393216a2b0964e SHA-256: c2ebbef85bed0cc914519346bb38ad9d9057cca501647819c2336f4648b7c093
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one prominently featuring 'payroll system proposal pdf' in its query string, suggesting a phishing or social engineering lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://seumenha.ru/award?keyword=payroll+system+proposal+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490274/normal_6030005b8b0a3.pdfIn PDF document text
    • http://gatorama.fun/sadamsuok1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423195/normal_5ff4f37cac11e.pdfIn PDF document text
    • http://inostrana.com/easy_bowling_drawing79yyd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413226/normal_6023f2cd8a160.pdfIn PDF document text
    • https://famixarusefon.weebly.com/uploads/1/3/4/3/134396739/8356294.pdfIn PDF document text
    • https://mafugefowodofo.weebly.com/uploads/1/3/1/3/131378796/lepufozenibilut.pdfIn PDF document text
    • http://ezfix.asia/how_heavy_is_a_15_hp_yamaha_outboardtgw5j.pdfIn PDF document text
    • https://ledapenilodaro.weebly.com/uploads/1/3/1/0/131070651/wotal_tivabok_nekegudalagu.pdfIn PDF document text
    • https://bezebaterizijir.weebly.com/uploads/1/3/1/3/131384714/lilunilugop-nubunejefeju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500187/normal_5fc90a345a75e.pdfIn PDF document text
    • https://girisuwudogepo.weebly.com/uploads/1/3/0/7/130776006/pixogal-wudigoz.pdfIn PDF document text
    • http://pitushok.fun/sugazopowezimuwuledadkyfo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e1eb4c46-79a7-48fa-8c7c-7ec070dd814d/91833465648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e4bb4cd-4c1f-4fac-aa49-89fb1a1fd872/what_makes_the_castle_of_otranto_a_gothic_novel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6ba08eb-c101-47c2-bf2f-fe7afd1a4a4c/friedrich_nietzsche_asi_hablo_zaratustra_resumen.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/xopimufebijamitanatoketud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffc638ae-6013-4331-b4dc-41d488d0d20d/are_all_ram_compatible_with_all_motherboards.pdfIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_6a8cdbad5d0040228a22f9e0e5651061.pdf?index=trueIn PDF document text
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_96d640fd80de45ff841f5a58a6c40a03.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dudurat/they_say_i_say_chapter_5_summary.pdfIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_2ff686fbaf654f19b0b9a45e9b0020c4.pdf?index=trueIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_77717dc8a1cc4d0dacf3716e2d7ef71e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/bafogalubu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBE 4924 bytes
SHA-256: bcc6f5c01386e12a92f61a87b1599b644599ee4fa55befc83ccf5011422ddc1e
font_01_sfnt_off00011f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F87 10824 bytes
SHA-256: 31c0e1a440a9aa867581ec24f159850e8f0d8c98384ca9ef458b6b7363288186
font_02_sfnt_off00014450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14450 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361