Malicious PDF — malware analysis report

Static analysis result for SHA-256 c534b3ca8c812ce1…

MALICIOUS

PDF

76.2 KB Created: 2021-05-28 15:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8b34073658ba0dee1085b1a857a78bb7 SHA-1: 2047bdbc51453e1912772a43d0923e0aa8cb53f3 SHA-256: c534b3ca8c812ce1f612f9b92de54bca556042a2cee5c47c1411971dd518281f
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 of which are hosted on disposable domains, indicating a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs and the heuristic firings related to PDF link farms point towards an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

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://golowaki.ru/strik?utm_term=hp+windows+server+2012+r2+foundation+iso+download+google+drive PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498345/normal_604b8a2255d5b.pdfIn PDF document text
    • https://kipowiginudi.weebly.com/uploads/1/3/1/3/131383469/goxewamirut-saferutujo.pdfIn PDF document text
    • https://sapemeke.weebly.com/uploads/1/3/2/8/132814969/venaviwexilokedi.pdfIn PDF document text
    • https://wupizesave.weebly.com/uploads/1/3/4/5/134581048/pakukexolatuv.pdfIn PDF document text
    • https://kewalagaxed.weebly.com/uploads/1/3/4/8/134864879/wixebi.pdfIn PDF document text
    • https://sabovewedasujak.weebly.com/uploads/1/3/4/4/134493104/fa22e3f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423471/normal_606e7848546bc.pdfIn PDF document text
    • https://donedupefunesu.weebly.com/uploads/1/3/1/6/131607777/vezimixujos-zosimadesive-vamukuvudasiwuw-junuxuxubujuda.pdfIn PDF document text
    • https://fidejilajusaxe.weebly.com/uploads/1/3/4/3/134363993/966a7ad9190d87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411717/normal_5fcbed28a1a9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419650/normal_606e498383faf.pdfIn PDF document text
    • https://riledamulobav.weebly.com/uploads/1/3/0/9/130969772/f390c.pdfIn PDF document text
    • https://tugemizibu.weebly.com/uploads/1/3/0/7/130739278/484217.pdfIn PDF document text
    • https://mosazipabefo.weebly.com/uploads/1/3/4/7/134735261/d3a5ef.pdfIn PDF document text
    • https://rosajojuzexoked.weebly.com/uploads/1/3/0/8/130874599/nerulasuwepedepij.pdfIn PDF document text
    • https://fuxozixer.weebly.com/uploads/1/3/4/6/134694245/2820317.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/b818346e-fd51-444e-a6c4-62b1013319f4/bagefew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94fb1c1d-c3b2-4bc7-8b56-cc6727d85ff8/definicion_de_desarrollo_econmico_segun_autores.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5ee9534-109f-44aa-aa18-923653334950/fejarinuzufufu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eff81242-d417-44f0-bac4-fd3abb2528c3/kill_team_rogue_trader_buy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4d90a72-58e0-459c-974d-5e98d5766d13/15623090779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91d11e62-d750-44db-b810-eb7d819c373e/what_is_error_code_51030_on_wii.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/752dc3b4-e965-4b19-ae1e-f25ad11f49fd/32666611391.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_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 5648 bytes
SHA-256: e2508ee98613883747db0eb22d66ba5d3bdd94848a8a57a186957c573a6cd3c7
font_01_sfnt_off0000fbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDA 11012 bytes
SHA-256: c16c25c5b600bb12037a28476175c0df4ce2ac27ba6b1af361cc0c741653e7b6