Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82c95966c7464d0…

MALICIOUS

PDF

76.0 KB Created: 2021-04-17 21:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8871b21dfb82ed854618e42816a75735 SHA-1: 53180ac7e2094c3b7a120b4a8817a863e230372a SHA-256: f82c95966c7464d05027f607e8c7024749e4b464a73b1f89a990dec51f78b297
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 lure. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous unknown reputation URLs strongly indicate malicious intent. The ClamAV detection and ML classifier further support this, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=fortune+2020+predictions PDF link annotation
    • https://luvagifewu.weebly.com/uploads/1/3/4/7/134766249/e443b9791.pdfIn PDF document text
    • https://fogofude.weebly.com/uploads/1/3/4/3/134322730/2655591.pdfIn PDF document text
    • https://pafebexazare.weebly.com/uploads/1/3/1/1/131163914/3566691.pdfIn PDF document text
    • http://immorta-cross1.club/64697814164ccj2p.pdfIn PDF document text
    • https://garuvopu.weebly.com/uploads/1/3/1/3/131398288/ladizif-bulorevoku-zujuluger.pdfIn PDF document text
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/giwizelajo.pdfIn PDF document text
    • http://item-get.top/reta_tu_vida_gratisefg42.pdfIn PDF document text
    • https://dogaralezuj.weebly.com/uploads/1/3/1/6/131637140/e7abb2a95dca6.pdfIn PDF document text
    • https://fomimixa.weebly.com/uploads/1/3/4/7/134775862/matisasimaja.pdfIn PDF document text
    • https://toxofeleziwogiz.weebly.com/uploads/1/3/1/4/131406173/zozonoxobodi-sagar-vijigidip.pdfIn PDF document text
    • http://vasizazesunof.medianewsonline.com/wokuwulavufi.pdfIn PDF document text
    • http://wigobike.sportsontheweb.net/blumgart_textbook.pdfIn PDF document text
    • https://xidumalebuwun.weebly.com/uploads/1/3/4/8/134894794/93fa4bc.pdfIn PDF document text
    • http://kafidovomiguvo.mywebcommunity.org/wegekekepevesusimomupazok.pdfIn PDF document text
    • https://pumijisiror.weebly.com/uploads/1/3/1/3/131381241/19e4d724f31.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/297ae0df-81d6-4ce9-868c-945d12fda33c/tipos_de_medios_de_comunicacion_masivos_y_no_masivos.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/nanijevesis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0231fc8-fd0d-4a18-a8fa-2f4ee2bdcc2a/nuxofot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e14506b2-7f88-41e6-ba76-97ca34d0bcc3/winnie_the_pooh_books_complete_collection.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_off0000ed4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4A 5052 bytes
SHA-256: 76b0480cdc7acfc439f737ff073bf070136c2787438868594c410563d8a1fbea
font_01_sfnt_off0000fe8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8E 10724 bytes
SHA-256: 165a8550e81d9d9449c9375acf15af99c8a1e8bace5ecd3cadac0f845aa266bd