Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39b509dbffe2848…

MALICIOUS

PDF

72.0 KB Created: 2021-06-08 12:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f615c520ae6566b2b7a24d2e981a8543 SHA-1: 3e031112e7728c4a322c3174e34d6e37a701cb5b SHA-256: d39b509dbffe2848081aee92d7c3e21073f826da3f0256fe62bad9e96f9dd910
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. This suggests the document is likely used for SEO manipulation or to distribute malicious content via these links. The ClamAV detection and ML classifier strongly indicate maliciousness, and the presence of embedded URLs further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://zajinet.ru/123?utm_term=by+free+form PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402933/normal_605d88561fe11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410975/normal_6065f6284a0ce.pdfIn PDF document text
    • https://sukivafuxek.weebly.com/uploads/1/3/0/8/130874221/pileterimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425484/normal_6048de66cddea.pdfIn PDF document text
    • https://rulewosiziruzo.weebly.com/uploads/1/3/0/7/130739522/jetumedegetedi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443823/normal_603eb2382175f.pdfIn PDF document text
    • https://gisoxesasolide.weebly.com/uploads/1/3/4/5/134590405/tapoxodu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368225/normal_5ff2568463973.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369514/normal_6036b2ce2f1b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417305/normal_602d079878d7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453326/normal_60184bb6768c6.pdfIn PDF document text
    • https://raxipufed.weebly.com/uploads/1/3/4/4/134474150/masitimiwolexoku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401696/normal_6064c39319bc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_6038614e587e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424036/normal_5fe7b0b01dd40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503033/normal_6029a727a9ebe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470979/normal_5fcf12d2e9900.pdfIn PDF document text
    • https://fogufufizanalu.weebly.com/uploads/1/3/0/8/130813948/wakewoteli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://furalagaposu.pbworks.com/f/tupilaradufokiwidagog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31eabf57-7440-48bf-9545-4e6a8b714c5d/how_many_spell_slots_do_warlocks_get.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b22b3c45-475d-40ab-8f6b-9995ae0622cf/dafejidabenagid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfb61e57-5d7d-43e6-accf-91317a8f6133/lord_of_flies_book.pdfIn PDF document text
    • http://kefimazusob.pbworks.com/w/file/fetch/144827202/how_do_you_put_transmission_fluid_in_a_2005_cadillac_cts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/893af0dd-1383-4f6c-9f28-b6e5a48807ff/vizio_sound_bar_connect_bluetooth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8877ac9c-83c3-4b60-bdf8-156767f1411a/ganajefowulim.pdfIn PDF document text
    • http://kepojijudiva.pbworks.com/f/26184525689.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_off0000e1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 4644 bytes
SHA-256: e2c4929da97cf980368a7e935154a7887f8738057fe01009b4e07c8a78da8823
font_01_sfnt_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 10004 bytes
SHA-256: 9c4789f09adf43fe91a7a8a3b59851e77878969c61d76654484c7f16660a7028

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