Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b1dd626cca7ef6…

MALICIOUS

PDF

79.7 KB Created: 2021-05-20 15:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 690e5dc0f2b790762a6cd671bdbe2e7c SHA-1: 98f996f60568fde0cf740e434e8efdcf6ec3da14 SHA-256: f7b1dd626cca7ef62afc183b60ea4b2372a04349f57c9ce70b46a61649564fa1
186 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as a link farm and detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to disposable domains, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to create a network of links for SEO manipulation or to host malicious content.

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://lozipotod.ru/strik?utm_term=dawn+of+war+soulstorm+ultimate+apocalypse PDF link annotation
    • https://tediditapudet.weebly.com/uploads/1/3/4/6/134693156/lesur-wavavowajejof-xivogelevimamo.pdfIn PDF document text
    • https://pibigetikuke.weebly.com/uploads/1/3/5/3/135387636/599652.pdfIn PDF document text
    • https://lexeponin.weebly.com/uploads/1/3/1/8/131856664/46670.pdfIn PDF document text
    • https://dezusopivelisuk.weebly.com/uploads/1/3/4/7/134734284/kaweduzologisade.pdfIn PDF document text
    • https://gaxopekel.weebly.com/uploads/1/3/0/9/130969853/3054821.pdfIn PDF document text
    • https://xuwogufovesuvem.weebly.com/uploads/1/3/1/4/131406895/damedesa-juvefoxijego-bokezo.pdfIn PDF document text
    • https://dusitibepilezu.weebly.com/uploads/1/3/1/4/131437978/2211172.pdfIn PDF document text
    • https://gafewabonir.weebly.com/uploads/1/3/2/6/132696171/vifusokafatore.pdfIn PDF document text
    • https://nuzozixajalupik.weebly.com/uploads/1/3/0/7/130739607/97355db3038c988.pdfIn PDF document text
    • https://tugiwosigef.weebly.com/uploads/1/3/2/7/132740290/54440f.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/dd4a42a1-971c-4610-b8b6-94f08ec0ff1d/graphic_novel_comic_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c23367ea-097c-4db3-83d7-d67e46b7c602/vintage_montgomery_ward_riding_mower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85b679f4-6f49-4ed0-97a7-7ab69091280a/72943032523.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/apple_support_watch_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/56032251339.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b99289ee-a76a-4d02-8a44-7b5a6b428033/78827449703.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/bollywood_songs_songspk3.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/netofixopusurop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b0125c-668c-45bd-b149-1e700549a111/tosudironekazomizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90e351d2-ea27-4ff1-a79f-59e8253dc5a4/22851467441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d031b59a-466f-4b21-baea-e637e65ba63b/pijakali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d96d69-9ec0-4126-9af4-b151f80c0075/fonerebozukixa.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_off0000f5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D6 5356 bytes
SHA-256: 278818ee6c64fb46682410296adc70d46ac9df9f46321e6cbdc7a68fdf44bac4
font_01_sfnt_off0001081a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081A 12116 bytes
SHA-256: 592981db39cb04832aaea108ccf5ddbc738fca3a61400f69b745e30ba9244886