Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb6917c4ab0f563…

MALICIOUS

PDF

81.9 KB Created: 2021-05-28 22:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 297158c211e3b6cc45fb43c77d2b00bb SHA-1: c957460e787b2d2fa99c103d0144180b6e720cf8 SHA-256: 7cb6917c4ab0f56378e18dd5e096614d29f817643e7b1b1fe3d6c9e8889e04d6
186 Risk Score

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 0.9993

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://gimoguvi.ru/strik?utm_term=purposive+sampling+in+quantitative+research+pdf PDF link annotation
    • https://supimoxu.weebly.com/uploads/1/3/5/3/135319300/felugavizevaf_tomibubilim_tiravowowew.pdfIn PDF document text
    • https://lajojadarexod.weebly.com/uploads/1/3/4/5/134506383/vimebaresod-tuxavazizi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450048/normal_5fe53b5b0761e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386076/normal_602049c371341.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464315/normal_5fcbd127f36d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443602/normal_5fd6126b46d67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450256/normal_60340b3110f38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451736/normal_5fd654c079e9b.pdfIn PDF document text
    • https://morekifozolil.weebly.com/uploads/1/3/4/3/134332894/wusivagamudesov-gedofo.pdfIn PDF document text
    • https://fotewusobowo.weebly.com/uploads/1/3/5/3/135339642/gugovinivaxedos_semorifopud_watijomo_wivaxowisavejot.pdfIn PDF document text
    • https://dirotigakavomak.weebly.com/uploads/1/3/4/2/134235834/3b234dc9891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426415/normal_6062650fdd61f.pdfIn PDF document text
    • https://rimidewazasi.weebly.com/uploads/1/3/4/3/134317879/8991068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480590/normal_604cf505907f8.pdfIn PDF document text
    • https://luralaxigagu.weebly.com/uploads/1/3/4/8/134868525/919584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381085/normal_602dd2519bdbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417207/normal_606a69553c219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387919/normal_5fd2f50fb7adb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481676/normal_5fe0a41097a55.pdfIn PDF document text
    • https://sikalejewop.weebly.com/uploads/1/3/5/3/135341852/9227117.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/152ecc70-5269-4462-802c-542cdb428b86/1698919420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/398d9c8c-a674-4fbd-8973-deb563413490/descargar_juegos_para_psp_android_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb367bc6-8560-4a49-a19e-333bb7e31797/zubik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c82d4ea-dbe4-423e-8601-9d4f6182fce7/is_it_ok_to_touch_your_belly_button_while_pregnant.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_off00010131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10131 5756 bytes
SHA-256: ecc726a64bcca926ea4271f0571250d4f7346cb56954ee5edd46785d577dc516
font_01_sfnt_off0001149d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149D 10968 bytes
SHA-256: 093d710f40376eaa16920abc67f6f66423acae43f43bea307ebd9a5875c55e2e