Malicious PDF — malware analysis report

Static analysis result for SHA-256 6092ae87454968a0…

MALICIOUS

PDF

79.3 KB Created: 2021-05-28 06:39:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: b96ec918cd53fab3c160f7356c8ff904 SHA-1: b87d771cd1b05ca2a61931f459f3e9ab91fb7f49 SHA-256: 6092ae87454968a06b4b286f14e6d6b6d0e3ffb1389414af592d93d6df46b30f
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 0.9996

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://zajinet.ru/123?utm_term=a+k+s+ka+full+form PDF link annotation
    • https://gagopono.weebly.com/uploads/1/3/2/6/132681316/fefebe72aa0.pdfIn PDF document text
    • https://zemizipip.weebly.com/uploads/1/3/4/0/134098502/3e039c9.pdfIn PDF document text
    • https://gawajofanobovap.weebly.com/uploads/1/3/5/2/135296378/6b179d7d2e.pdfIn PDF document text
    • https://fepaxumezo.weebly.com/uploads/1/3/4/3/134320712/9725903.pdfIn PDF document text
    • https://finikepimu.weebly.com/uploads/1/3/4/0/134017618/edad8a96f.pdfIn PDF document text
    • https://fujazilumekopel.weebly.com/uploads/1/3/2/6/132681311/jagavo.pdfIn PDF document text
    • https://kakabotosor.weebly.com/uploads/1/3/0/7/130775724/tavawadake_terawoga.pdfIn PDF document text
    • https://fuvexowigirupog.weebly.com/uploads/1/3/4/8/134896800/3601007.pdfIn PDF document text
    • https://vaferomesab.weebly.com/uploads/1/3/4/3/134351928/4370d5.pdfIn PDF document text
    • https://xanilavobug.weebly.com/uploads/1/3/5/9/135959945/9009841.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/0451c94b-dd62-4b5c-8b57-c48c589467d3/h81m-p33_ram_overclock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52f2b737-98f8-484a-aad7-b1d5df36aaaa/6018764798.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43462687-6027-4287-a46d-c733fd8040d2/89465105193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d2921d-9248-4a3e-bead-4abc745d617d/62971147617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccbc0490-110c-463a-8c83-1a225b88f139/paguzonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dafe475-79f5-41ec-8070-0cb42b008050/padi_open_water_diver_course_final_exam_answer_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8691eaa1-3ce9-463b-9d91-c446282fe461/4848549147.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fa1742d-3ade-4e81-87e2-9c331b7d3da7/54302507545.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9b37438-c7a7-4ea0-bddb-0a1350ba1b83/89706306021.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BE 4092 bytes
SHA-256: 4ceb8e7931dca7492a2c63623f5dee70630f567e9ab25a367237cebd8fbebeb8
font_01_sfnt_off0000e751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE751 4964 bytes
SHA-256: 5633a40837e8cf8abcc99e1a77972c220936ede884b0eb11f74d9f81477470ca
font_02_sfnt_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 11232 bytes
SHA-256: 6bb986243d602f5e0ac2c9daa5fefaa64ec3e12aaf8b1873c6c75172b5de4168
font_03_sfnt_off00011ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA6 4044 bytes
SHA-256: 3e01f2991ebff31b2bd2a5520bfd678a7e0bed46c32ac0a10338b92cd8698218