Malicious PDF — malware analysis report

Static analysis result for SHA-256 33cc48bb1d4bee44…

MALICIOUS

PDF

79.9 KB Created: 2021-03-03 06:12:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 834537614684e352ff9229154c6825af SHA-1: e8720e2120732a5e4457491fae67349544e36da1 SHA-256: 33cc48bb1d4bee44fe07623a44ae5ef440526f8d9341e2205581524bc89c4e67
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs, such as 'https://midufefew.ru/wix?keyword=does+nair+make+your+hair+thicker', likely serve as entry points to further malicious content or phishing pages. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a phishing or content-distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://midufefew.ru/wix?keyword=does+nair+make+your+hair+thicker PDF link annotation
    • https://tazumeter.weebly.com/uploads/1/3/1/4/131438167/vodiwip-sukonarut.pdfIn PDF document text
    • http://kungfumalibu.com/92252992843djzb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403127/normal_6023c16aa78e8.pdfIn PDF document text
    • https://wubepifumemav.weebly.com/uploads/1/3/4/1/134109226/luzeba.pdfIn PDF document text
    • https://jaluwaxigesife.weebly.com/uploads/1/3/4/6/134640648/5599198.pdfIn PDF document text
    • http://natural-shop.info/how_to_draw_furry_downloadhc7t3.pdfIn PDF document text
    • https://vifazadaza.weebly.com/uploads/1/3/4/8/134883600/saxor.pdfIn PDF document text
    • http://kwini-fini.online/paramazositrw4bn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392667/normal_5fe3eb6b4380c.pdfIn PDF document text
    • https://kemewekodu.weebly.com/uploads/1/3/1/8/131857474/de642e.pdfIn PDF document text
    • https://woninulanomawij.weebly.com/uploads/1/3/4/6/134670754/nasetikapebenan.pdfIn PDF document text
    • https://zuvimetuna.weebly.com/uploads/1/3/5/3/135304981/xagufedazosun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451565/normal_5ff336c065582.pdfIn PDF document text
    • https://wunaramalus.weebly.com/uploads/1/3/4/5/134576193/4562819.pdfIn PDF document text
    • https://gobufitiribe.weebly.com/uploads/1/3/5/3/135321776/3259686.pdfIn PDF document text
    • https://rozenawaxu.weebly.com/uploads/1/3/4/5/134517597/88b87d7.pdfIn PDF document text
    • http://hookup153.site/group_theory_in_physics_tungyd5m8.pdfIn PDF document text
    • http://wotaxatumumodok.sportsontheweb.net/dungeons_and_dragons_players_handbook_free.pdfIn PDF document text
    • https://nodirodenesubob.weebly.com/uploads/1/3/5/9/135986245/3073931.pdfIn PDF document text
    • https://vokubopupabilu.weebly.com/uploads/1/3/4/6/134691430/sewolona.pdfIn PDF document text
    • https://befuvabesuwab.weebly.com/uploads/1/3/0/7/130740391/tunifugebo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384150/normal_5fd18f1350807.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 5052 bytes
SHA-256: 7048abafb3d2c94f6d895f3e5888857bc1aa55d4ec4bdca0c3a713e1bb7846f7
font_01_sfnt_off000100dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DC 10304 bytes
SHA-256: bac65cc938f44a9a7061b870132e00333eb6f672b80b69e392d9cdfa3975ab83
font_02_sfnt_off00012432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12432 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333