Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ca4c27d822656c…

MALICIOUS

PDF

78.9 KB Created: 2021-05-31 02:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 04594870c42e6353aff3c33c052b578d SHA-1: 583670e60aea9c9db5f678144e637f58c8b9d8fa SHA-256: 78ca4c27d822656c31b3b35ba95d72aa6c06661253f92cbe2edaf921dd66c30f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The primary URL, 'https://lozipotod.ru/123?utm_term=us+visa+application+form+in+lagos+nigeria', impersonates a visa application form to lure victims. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/123?utm_term=us+visa+application+form+in+lagos+nigeria PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425491/normal_5fd7e9d85baf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456378/normal_600c415413766.pdfIn PDF document text
    • https://lijoliwaxodoxi.weebly.com/uploads/1/3/1/3/131398144/878baf460046.pdfIn PDF document text
    • https://kefuvarunif.weebly.com/uploads/1/3/0/7/130739830/427482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423772/normal_6027ba7982bef.pdfIn PDF document text
    • https://wemavepudobug.weebly.com/uploads/1/3/4/1/134108610/latewen.pdfIn PDF document text
    • https://zivadufo.weebly.com/uploads/1/3/0/8/130874541/gidodokejugid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487888/normal_5fe65843713fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415300/normal_5fffd99c82c42.pdfIn PDF document text
    • https://xovirekines.weebly.com/uploads/1/3/4/6/134648888/towaramawufonaj.pdfIn PDF document text
    • https://fakibugopozap.weebly.com/uploads/1/3/2/7/132712115/1519033.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388282/normal_5ffa8e7ce7bbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530151/normal_5fc813f99f114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505687/normal_6050fef67d605.pdfIn PDF document text
    • https://nogonosexenepe.weebly.com/uploads/1/3/4/6/134674491/6610659.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/85d85923-5822-4b11-a478-95415aeddefd/45953729732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f6cce4b-bbac-4ade-b1fc-12a9e52820f8/eternal_water_heater_e27.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbca245a-c845-4430-acfc-94f7e664fb31/skyscan_atomic_clock_instructions_28900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be6b920-45b4-430d-b2f5-f8971c384305/jogiresulunipizirojakiti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a39d942f-2f97-436f-bd56-d5f24add4288/rukuboxax.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_off0000f7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F4 5388 bytes
SHA-256: ef54c3b36888ecbbefb7ead0bbcacc47ed620516eb9574cbd05c1e34cbf1a5e8
font_01_sfnt_off00010a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3F 10464 bytes
SHA-256: 8ec6a192b75a12ee06bb8fdf8dafff4f0ca1820c32d671d73e81d05da59573cb