Malicious PDF — malware analysis report

Static analysis result for SHA-256 b639f00ec1842190…

MALICIOUS

PDF

80.8 KB Created: 2021-03-13 22:56:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 86b4f3b960a2b58693abf0f887724dab SHA-1: b12da4cfde5a7326bffd674486b157109533d328 SHA-256: b639f00ec1842190096c26d4d50940a2a19527b392b24ac698803d9d75bfd82a
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan variant. It contains numerous embedded URLs pointing to various domains, many of which are hosted on disposable or suspicious platforms, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/wix?keyword=facets+healthcare+definition PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381289/normal_5fc692026aaca.pdfIn PDF document text
    • http://justamorem.com/conception_2_ending_guide64l3t.pdfIn PDF document text
    • http://gta-msk.ru/popirobun6iok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501029/normal_6020a33993566.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465687/normal_5ff08149b994c.pdfIn PDF document text
    • http://motorutovibipe.sportsontheweb.net/agricultural_extension_and_communication.pdfIn PDF document text
    • http://xupulakikovuxo.mypressonline.com/how_much_is_a_briggs_and_stratton_engine.pdfIn PDF document text
    • http://sosiwawivijomo.scienceontheweb.net/goriz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454677/normal_5fd2a42b6ef4d.pdfIn PDF document text
    • http://pejelurim.getenjoyment.net/gipalonemejefisusijaxane.pdfIn PDF document text
    • http://akfb.online/logic_pro_x_review_youtubealht7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ladorum.epizy.com/yard_machine_lawn_mower_recoil_starter_assembly.pdfIn PDF document text
    • http://ripogulakurido.epizy.com/kimiseroriwiwutafuxabuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/787b3aa5-1e02-4651-b5e1-a6f29e2b6044/81897040768.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5965235-b44c-4bc2-bfc3-5a3079f82b61/glock_19_gen_4_vs_gen_5_cost.pdfIn PDF document text
    • http://reridinal.epizy.com/dog_mange_pictures_symptoms.pdfIn PDF document text
    • http://zejusamipokera.myartsonline.com/wuwulokudifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/874320c8-63ab-41f2-a0ba-05e8666115e4/29656523518.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af8da6af-fa04-4697-b383-45c7361b7060/21924915616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e28af98-af03-4729-813c-59877a811698/51557503426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/406484a6-3346-4800-88dc-a845ae338038/mr._coffee_12-cup_drip_coffee_maker_red.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0adcb5e-4441-480e-abfa-c9a6e1795940/55364872814.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_off0000fdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBB 5064 bytes
SHA-256: 1b88656b20ee8452704bf7c649a6b5c5b2b4f2d9a56a19c87685492d00999953
font_01_sfnt_off00010eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEB 11496 bytes
SHA-256: 3ea7bcf3c3a814287475bb1f59127b854865b98f49d2303389c9bc353a5a9bb0

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