Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18a8a3dc6b68d0f…

MALICIOUS

PDF

71.4 KB Created: 2021-06-11 19:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 45e330564558c6d013c783ad81c61b74 SHA-1: 3eed226ab392707c5ca24e98342f4126a81fc534 SHA-256: b18a8a3dc6b68d0fcd90b6fa9988f9b2b41b676b1cfcd34241f80804f68c8697
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The 'doc body' content, though garbled, includes a search query for a movie, indicating a lure to entice clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://wastran.ru/pbw?utm_term=hansel+and+gretel+witch+hunter+full+movie PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465930/normal_5fda69cc67cf5.pdfIn PDF document text
    • https://lemoxubasox.weebly.com/uploads/1/3/4/3/134329143/5206391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388293/normal_606ae9eae0cbb.pdfIn PDF document text
    • https://kakijukiwobak.weebly.com/uploads/1/3/4/3/134322026/funizepijamuduti.pdfIn PDF document text
    • https://veriketosamu.weebly.com/uploads/1/3/4/6/134675732/medimopuwovo.pdfIn PDF document text
    • https://samovibemajus.weebly.com/uploads/1/3/4/5/134597991/2586489.pdfIn PDF document text
    • https://lokenomosotim.weebly.com/uploads/1/3/4/4/134499182/wizibefapexuwabijevu.pdfIn PDF document text
    • https://kodejisejawap.weebly.com/uploads/1/3/2/3/132302923/84d4af214cbc.pdfIn PDF document text
    • https://zudizobi.weebly.com/uploads/1/3/4/8/134860565/foxewawis-turotifalejax-papowigumafemad-nuguxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472793/normal_5fd09932e9337.pdfIn PDF document text
    • https://sedezexe.weebly.com/uploads/1/3/4/3/134342112/duzirukanog_gevelubolem_gepibuv.pdfIn PDF document text
    • https://vafebukuwu.weebly.com/uploads/1/3/1/1/131163563/3db10.pdfIn PDF document text
    • https://xuwulusepe.weebly.com/uploads/1/3/5/3/135310973/marepevip-bizexojeg-sogak-bopokerexa.pdfIn PDF document text
    • https://xemaxokiba.weebly.com/uploads/1/3/4/3/134350412/835525.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/a857df14-97f0-4f76-92d7-bc28a5054c7e/56706607922.pdfIn PDF document text
    • http://fudejob.pbworks.com/w/file/fetch/144520212/gunblood_unblocked_games_6969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9d65247-eb91-4d8e-b5d3-60bd64961f71/vosejer.pdfIn PDF document text
    • http://japakekuwita.pbworks.com/w/file/fetch/144989511/16452460618.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fb5b5eb-dfc7-493c-a2ba-a0653d89ee25/how_to_play_family_feud_app_with_friends.pdfIn PDF document text
    • http://foxubomo.pbworks.com/w/file/fetch/144950094/gedapivanixoxazoriwexum.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_off0000d336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD336 5548 bytes
SHA-256: e13aa3d44fc5b269c99038205fd122e0097ebdf63dec81ed6c07afa8548181c9
font_01_sfnt_off0000e606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE606 13420 bytes
SHA-256: 7453ddc577017eb6aa857bdbedf054f1697bd81665c50085891b8081840dd098