Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2472ae43493f52…

MALICIOUS

PDF

74.8 KB Created: 2021-05-24 23:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9f8a3a288c8a214ba2dac14326f72cc1 SHA-1: a6ee473decca8cc5369d9ec2f4c6df8d48a76c98 SHA-256: 6a2472ae43493f52122fe77a68b1485adf259fe3a7d52236070a11432209698c
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 or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=vince+guaraldi+autumn+leaves+sheet+music PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413693/normal_60566c73a2224.pdfIn PDF document text
    • https://migawireradafus.weebly.com/uploads/1/3/2/6/132695569/2be81aa.pdfIn PDF document text
    • https://wafulezejo.weebly.com/uploads/1/3/4/7/134748518/nizefa_zanojikebot.pdfIn PDF document text
    • https://dopotalufiru.weebly.com/uploads/1/3/4/6/134601398/e36e701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5fd62143d1220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443371/normal_6057c53a5f844.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480884/normal_5ff1dd994150f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379046/normal_601fab5c0acc6.pdfIn PDF document text
    • https://fomemifeju.weebly.com/uploads/1/3/4/7/134769467/gofaresek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494436/normal_5ff9dee02a015.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454162/normal_6003df540e300.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481157/normal_6040e94bd3207.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dukajevo/anarkali_full_movie_malayalam_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/915d4436-8359-4da1-a6b3-bac2ec8b9570/what_are_the_99_names_of_allah_called.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63147732-6692-45f6-99fb-ee54ffbebb8e/star_trek_voyager_kes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/808f7f8f-0688-4238-a234-ea55473066d2/10017030134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f6c6600-63bb-4fc2-83d4-5ca136a338fe/tivo_premiere_xl4_hard_drive_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37a6b58d-852b-40c7-9812-02662eb31e17/shadowed_souls_limited_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a65b9167-21c9-429d-8128-3438b7fb23ff/tamil_numerology_books_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/628d41be-a1cb-4f42-bf2e-d190bd7f9a39/mazakerewege.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/10148497293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0078ed6-f46e-45e3-8141-377816584c23/tabla_puntaje_psu_2021_matemtica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53a3c346-3495-43c1-919e-7982434b623c/24225888359.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_off0000e3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 5380 bytes
SHA-256: 84247c5bda3c9dc0c48730bb4d09e389723807711205d839c103ebc89859ede3
font_01_sfnt_off0000f5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E3 12244 bytes
SHA-256: bc1b3fa8bc74956695efe5f7da514257a4750208f25a0f6f53d1cf1d82c9faef