Malicious PDF — malware analysis report

Static analysis result for SHA-256 4034c458a62e2264…

MALICIOUS

PDF

72.7 KB Created: 2021-02-23 09:51:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5ecee8613a503dbcacd112f3d50aece0 SHA-1: e76b8a616f8708bd22ee01c2f8a8180c9a214357 SHA-256: 4034c458a62e22642921e5d1d95925f001219e82dd9b8ecbbf0865a22d9d0018
186 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to redirect users. The primary URL, https://jottigo.ru/strik?utm_term=mass+flow+rate+gas+pressure, suggests a potential phishing or traffic redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=mass+flow+rate+gas+pressure PDF link annotation
    • https://cdn.sqhk.co/bigulikexupa/fk2Nvgg/jurom.pdfIn PDF document text
    • https://tebadigizowi.weebly.com/uploads/1/3/4/1/134109241/909f12817c.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/HgeWXig/singing_in_the_rain_musical.pdfIn PDF document text
    • https://dobuwejakunarek.weebly.com/uploads/1/3/4/7/134772316/dufalofe.pdfIn PDF document text
    • https://cdn.sqhk.co/wofazexej/ibTgjjb/shark_dash_download.pdfIn PDF document text
    • https://ridijetovemeriw.weebly.com/uploads/1/3/5/9/135984977/27034945713.pdfIn PDF document text
    • https://fujowutel.weebly.com/uploads/1/3/3/9/133997949/5844958.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/cc658.pdfIn PDF document text
    • https://nefarixuk.weebly.com/uploads/1/3/1/4/131407944/4999536.pdfIn PDF document text
    • https://pixadodo.weebly.com/uploads/1/3/2/7/132740612/6a5a057696f.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/ge3EVMx/rpg_maker_mv_character_generator_online.pdfIn PDF document text
    • https://dujomimip.weebly.com/uploads/1/3/6/0/136086420/2909864.pdfIn PDF document text
    • https://nanuleseja.weebly.com/uploads/1/3/4/0/134012971/d5e4cf.pdfIn PDF document text
    • https://buvikibera.weebly.com/uploads/1/3/1/4/131453013/435cf507.pdfIn PDF document text
    • http://sapazukuwujoji.22web.org/fuxajutuforajekiwi.pdfIn PDF document text
    • https://bawokopo.weebly.com/uploads/1/3/1/0/131070727/2801124.pdfIn PDF document text
    • https://bixavovene.weebly.com/uploads/1/3/0/7/130775743/4850311.pdfIn PDF document text
    • https://dubitofux.weebly.com/uploads/1/3/4/4/134458445/webadekofur_wetoxala.pdfIn PDF document text
    • https://cdn.sqhk.co/lojumisebu/geskAji/75180422907.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/729bf81570378f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000df76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF76 5168 bytes
SHA-256: 726c0b9c224eaaed9da5c0cd679060e18e6686a3d3e73321db4ebbb54d5e610b
font_01_sfnt_off0000f13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13D 10620 bytes
SHA-256: 73d28aaec545e8e66a8fe9e1e985eae81fe316fcce69f5998ece694077e90db5

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