Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8b386e22e6e079…

MALICIOUS

PDF

74.5 KB Created: 2021-05-21 12:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9da8666b1faedac008c8c368aeb5c8d6 SHA-1: 74fbbd49ca718019631117457f054d6e940e5673 SHA-256: fd8b386e22e6e079d234419ce692eb5219ddf2ddc519c037763d5056b55b4e95
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 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/strik?utm_term=hypnosis+mic+buster+bros+vs+mad+trigger+crew PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371508/normal_601efb18d21d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375207/normal_5fe8f5032be8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466996/normal_604a15ff33ded.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450730/normal_601bf907483a4.pdfIn PDF document text
    • https://makigomeludawuk.weebly.com/uploads/1/3/4/7/134748455/fenowu.pdfIn PDF document text
    • https://rumodabumuxe.weebly.com/uploads/1/3/1/8/131857513/tarosijesoxowi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392463/normal_601c03f385b46.pdfIn PDF document text
    • https://kenojulovananav.weebly.com/uploads/1/3/4/0/134016885/vonepotewuz_dexuxog_ritifuzotibe_xodaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478950/normal_604e950a31eea.pdfIn PDF document text
    • https://jadotonevuwupu.weebly.com/uploads/1/3/1/4/131407011/3071278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379722/normal_602fd6dcb454d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_6049a6ec87ae9.pdfIn PDF document text
    • https://jematujevuzonip.weebly.com/uploads/1/3/4/2/134235480/pogewulotidureg-wewiwow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459319/normal_5fca84f8579a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485448/normal_60430a301bb6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414353/normal_600747d849337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479236/normal_604cf0663f284.pdfIn PDF document text
    • https://ratowoxure.weebly.com/uploads/1/3/4/5/134584599/5c48c39.pdfIn PDF document text
    • https://sofamilases.weebly.com/uploads/1/3/5/4/135401016/bigul-vuxulinupa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/42f9e64b-95a0-449e-b392-dbbb87bc8c7e/porque_funes_el_memorioso_es_un_cuento_fantastico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ab444d4-6ef1-4352-9b16-45a04d47641a/28022694212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ade000ee-328a-4de0-be9b-63c24dc77829/rockcrok_pizza_recipes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DC 5596 bytes
SHA-256: 328a617cbb56ef5f62268c307aeceb2430535af2d5f960ce3f802521b99b9744
font_01_sfnt_off0000ead2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD2 10392 bytes
SHA-256: 9eade0c2538f70eb1f844a3f1a979ab610a206604e467ae296bda511f4a5e971
font_02_sfnt_off00010e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E74 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378