Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e2075d92918bbd…

MALICIOUS

PDF

81.7 KB Created: 2021-03-14 21:30:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 11c2d5754412a5f39c424bfbd4085682 SHA-1: 148f0384481f39752d3c81423c6d811b473f0197 SHA-256: c7e2075d92918bbd85e5460aca1b94d0d50266083728574c65090b4c67eaef45
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://midufefew.ru/strik?utm_term=interview+questions+and+answers+for+hr+executive+position PDF link annotation
    • https://gogekelonirivi.weebly.com/uploads/1/3/4/4/134438841/133e4790db958f.pdfIn PDF document text
    • https://woziwapimarezex.weebly.com/uploads/1/3/5/4/135400795/cae811b581404b.pdfIn PDF document text
    • https://vugawijop.weebly.com/uploads/1/3/4/5/134594760/6df9d0.pdfIn PDF document text
    • https://gogabaxada.weebly.com/uploads/1/3/4/8/134852864/8599023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374185/normal_60462392b8bf5.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/zerefakizumaruwa.pdfIn PDF document text
    • https://metenesepagozo.weebly.com/uploads/1/3/4/7/134710396/pezigarowake_welanebup_jimapinoge_fodaxamovokowi.pdfIn PDF document text
    • https://papokekes.weebly.com/uploads/1/3/4/5/134599002/mixovav-jamowa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5fe6e8fc8e389.pdfIn PDF document text
    • https://wuremude.weebly.com/uploads/1/3/2/8/132815206/zemarugixusad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465249/normal_5feec2325e1b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418557/normal_603453fe616dd.pdfIn PDF document text
    • https://bamigifumu.weebly.com/uploads/1/3/4/4/134443618/pufurumesova.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/7e12704a-d57d-4c80-886f-a81c6d973a2c/moto_g6_wont_switch_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b8f12f6-3c1f-4cf5-a0d2-a0d8f2298890/hitachi_c10fsh_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29faffda-18ce-4b1d-9f06-b25b5204f452/pofufow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7d4cc6e-7bf0-4a89-a491-7aee39b0cd28/what_are_the_goals_of_cbt_session.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a01e891e-290e-46ac-b3c8-6b1da20b3db2/gudinexojuvakugosejewijos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a5414d8-4588-4d3b-a852-61ff30d74108/84255725771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a59b4f-8147-45b7-8465-ba688bf4efcc/94485715725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ba31f80-d4bc-4403-98a5-73cf6356244d/what_is_accu_chek_aviva_control_solution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e5489fd-e71e-47f9-b841-eb4df3d1da4b/kajaweperipikagutojazopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5886929d-40b4-4274-8929-070c1ee4cb98/casio_ctk_7200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98941f6d-99db-4ae0-ab11-82869017e7f8/how_to_store_ironman_inversion_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7e7cad3-359f-4e5a-af97-f2443e94c7f3/zufolupaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20b24aa5-300d-4232-adc6-3ec33e17a27d/dapes.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_off0001036b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 5496 bytes
SHA-256: ded683284dd72a134f652d3c72ae29c355bc17949413778efafd759a60b2965b
font_01_sfnt_off00011632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11632 10476 bytes
SHA-256: f0b361bbc19779fc61f49a1f5e669b076b698a36557fbc04e46bae119584bf42

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