Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ecb0b8e4d38f326…

MALICIOUS

PDF

75.8 KB Created: 2021-03-05 02:07:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 992174eeb8913fd9137a0a8fd6823254 SHA-1: 806fec8060b0fed770053456dc37e090ecd30498 SHA-256: 2ecb0b8e4d38f326ee9e39576b3c99d9ee76f0ad82896a4cf4a509dc963736a1
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to disposable hosting. The ML classifier and ClamAV also identified it as malicious. The embedded URLs suggest a phishing or SEO manipulation scheme, likely intended to redirect users to malicious content or further stages of an attack. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=harmony+hub+light+turns+red PDF link annotation
    • http://fizasibako.22web.org/79924339056.pdfIn PDF document text
    • https://bejejedagaf.weebly.com/uploads/1/3/4/8/134862385/bedekiguforerapeni.pdfIn PDF document text
    • https://cdn.sqhk.co/medukukekuke/aieqwje/mlb_playoff_format_2020_explained.pdfIn PDF document text
    • https://cdn.sqhk.co/pibexezases/gheujbu/10_best_bowling_balls_2018.pdfIn PDF document text
    • https://tulugawaluga.weebly.com/uploads/1/3/0/9/130969515/zazobijito.pdfIn PDF document text
    • https://fejilezujew.weebly.com/uploads/1/3/4/3/134340931/lelanumulo.pdfIn PDF document text
    • https://razebefalokugex.weebly.com/uploads/1/3/4/8/134895215/8363428.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/lajag.pdfIn PDF document text
    • https://cdn.sqhk.co/vibesadebo/hcKEiio/5758026810.pdfIn PDF document text
    • https://rutizinudepedo.weebly.com/uploads/1/3/4/4/134483735/dapevewojipo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/how_to_spotify_on_your_macbook.pdfIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_234d1c834980416fbf730d38e36f2d1f.pdf?index=trueIn PDF document text
    • http://robireroruvudi.epizy.com/presonus_studiolive_16.4.2_specs.pdfIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_31f711f39e4942bfba6e8e6858525f61.pdf?index=trueIn PDF document text
    • http://fekajot.rf.gd/68375206321.pdfIn PDF document text
    • http://zikukoji.epizy.com/bilejonukitazotuwinuzete.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/lululun_sheet_mask.pdfIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_d7e13cbb102d4eb98a8164ec6fcceba9.pdf?index=trueIn 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_off0000dea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA0 3340 bytes
SHA-256: 788c1048ff4bfaa782e4c8a36fa57f5a4847adadfde2aef2d6263afd3d2a8b96
font_01_sfnt_off0000eaa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA3 5444 bytes
SHA-256: 39a4c6acbf099e52e3aca2e752cd5a7c98cba24ff05d1af27d735cb52d50de58
font_02_sfnt_off0000fcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFB 10828 bytes
SHA-256: 33d1e6f60749801656a0627d51d66dbccbb8ee3ac655651775addbad88b170e9

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