Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3e2e7de1320fa8…

MALICIOUS

PDF

82.0 KB Created: 2021-05-13 22:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2239927bea45e1b73b6a23b5291cd26c SHA-1: 7fc71040af25671530f71ef229e3e07516f61477 SHA-256: ce3e2e7de1320fa843d33b0ac928ffe11dc6ff04edb972bf5ab2fb0a6120c14d
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains text related to 'Fiio x1 firmware 2.0 download', likely a lure to entice users to click the embedded URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://lozipotod.ru/strik?utm_term=fiio+x1+firmware+2.0+download PDF link annotation
    • https://moxisubisoxotap.weebly.com/uploads/1/3/4/8/134893280/dipivasemevuxe_wexijixujojo.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/djcggc3/xelizuro.pdfIn PDF document text
    • https://cdn.sqhk.co/safubuguva/idsW4jh/cultist_base_slayer_key_not_spawning.pdfIn PDF document text
    • https://kutepuwabaluv.weebly.com/uploads/1/3/2/6/132681670/288060.pdfIn PDF document text
    • https://cdn.sqhk.co/refuvowur/ageDPia/gokanakoxajiketotigatavi.pdfIn PDF document text
    • https://delovamubikener.weebly.com/uploads/1/3/4/7/134707073/nonamodo-dorijuf.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/cggl2Nu/monster_maze_runner.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/oidMEgY/88628172286.pdfIn PDF document text
    • http://ragofilud.medianewsonline.com/roadhouse_blues_chords.pdfIn PDF document text
    • https://cdn.sqhk.co/lakanodip/zpXDRgc/vibositavulu.pdfIn PDF document text
    • https://virefogagivagu.weebly.com/uploads/1/3/0/8/130815228/5312814.pdfIn PDF document text
    • https://cdn.sqhk.co/wotirixa/hdcbggg/red_balloon_bookshop_saint_paul.pdfIn PDF document text
    • https://cdn.sqhk.co/bikugipozamu/dgj4Ogj/fun_phrases_to_say_in_japanese.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/fwbjggd/nopozi.pdfIn PDF document text
    • http://raxewaponoxiv.mygamesonline.org/52824511267.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/qjigkx1/92144958484.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vilepobafomunow.atwebpages.com/97250767627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f3f68af-df37-4003-b52d-8353ebc8393f/10868850002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53b9b9c6-4732-47f4-80b1-f4b0aef23187/62097083604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ec4b0c-c460-4896-a2f9-01d9d4b1cff1/what_happens_in_season_5_of_vampire_diaries.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7356da17-357f-4884-aabd-ca6db4f37a08/how_to_find_resistor_color_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bba0115-8ca0-4b2f-a9e4-b3ed5a30d15d/fly_tying_bench_orvis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d2c41f7-7d75-4bfd-832a-d5d6fc554fbf/87981802113.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_off0000f892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 1560 bytes
SHA-256: 71337577fef36e46ce718a09ca2836f03782d5f6ddaf742f46b904026ecd8998
font_01_sfnt_off00010083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10083 5348 bytes
SHA-256: c265d884d3a6085c0fe88599d120d2a05263b427762691ce852bf6f5233886f3
font_02_sfnt_off000112be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BE 11972 bytes
SHA-256: 63ffca4580bafc61abfe1364c0dba53241d6e219bb7c821fa114381ce504c50e