Malicious PDF — malware analysis report

Static analysis result for SHA-256 99be39be204290a1…

MALICIOUS

PDF

76.9 KB Created: 2021-02-07 14:16:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: beba403a3b29b587934d3ba81274d91c SHA-1: b167959dee1297eaf55625e7ee33ec3ad727d2d5 SHA-256: 99be39be204290a1ff47a80d5ddb31def63b3099e4abafda9dc136fb8a586c99
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate maliciousness, with the primary purpose appearing to be directing users to potentially harmful external sites. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a phishing or malicious redirection scheme.

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://bologen.ru/aws?utm_term=biomechanics+of+sport+and+exercise+pdf+free PDF link annotation
    • https://metoxuxiduwano.weebly.com/uploads/1/3/1/6/131636764/cec9d0ab8d691.pdfIn PDF document text
    • https://cdn.sqhk.co/wamitavixitu/6jjjgC4/surf_shack_coastal_kitchen_tampa_fl_33626.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/Dgfif28/74253587583.pdfIn PDF document text
    • https://nuvafuriwevejuf.weebly.com/uploads/1/3/2/8/132814848/rejolasodano.pdfIn PDF document text
    • https://wekegakusujesal.weebly.com/uploads/1/3/4/2/134266445/246bb.pdfIn PDF document text
    • http://winoraama.site/12500657567bhf9a.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/Y64OTia/rigigojunaj.pdfIn PDF document text
    • http://znatural.space/jomijobisadugiz6weiu.pdfIn PDF document text
    • https://tavabaxo.weebly.com/uploads/1/3/1/0/131071290/menez-pinis-togukaxifuna-wixaxesinamiv.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/njePm2Y/bollywood_songs_2019_mp3_download_320kbps.pdfIn PDF document text
    • http://mesretly.xyz/butterfingers_album_freex54un.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/idjiOjd/lightseekers_scannable_cards.pdfIn PDF document text
    • https://kabokikofonesa.weebly.com/uploads/1/3/1/6/131637300/e261f.pdfIn PDF document text
    • http://kfnwejfnkwheklf.space/nintendo_switch_controller_cyber_mondaywyehe.pdfIn PDF document text
    • https://tapukinag.weebly.com/uploads/1/3/1/6/131606864/2633420.pdfIn PDF document text
    • https://tuzuratodaf.weebly.com/uploads/1/3/0/7/130738639/vejadizisanupe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuzetewadan.epizy.com/avengers_movies_in_tamil_isaimini.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA87 5480 bytes
SHA-256: fe99b9e628cc2be586245d723390afb6b8466746afe6266d7dcecc1cf9ddb605
font_01_sfnt_off0000ed0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 10428 bytes
SHA-256: 7132c0fce6f61c802e4735592752c25b4caf7157b6d7ea96d3f492e60b36f506
font_02_sfnt_off00011022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11022 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e