Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad99452abb1b7ac9…

MALICIOUS

PDF

74.9 KB Created: 2021-01-29 07:40:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e5b776e1b9d9ce64488921ef6c9092d3 SHA-1: 2f59ac7472a488c2bf5737cc967fd81e188a113f SHA-256: ad99452abb1b7ac91fe69d2a9858936c4717a9b1cb49760ccf1c52e724a49b2c
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. The presence of ML_NYX_PDF_MALICIOUS and ClamAV detections, along with the PDF_SEO_LINK_FARM heuristic, strongly indicates malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the ML classification point towards a malicious document designed to redirect users to potentially harmful sites.

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://jottigo.ru/123?utm_term=diane+stupar-hughes+salary PDF link annotation
    • http://voseboler.iblogger.org/24414355888.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/gsvicif/8686214958.pdfIn PDF document text
    • https://nurosamemozixa.weebly.com/uploads/1/3/4/3/134375837/kirewubujaje_mutesi_rodovenupa_bafajojazimu.pdfIn PDF document text
    • http://stavki.link/watch_cloverfield_online_free_megaviv8udh.pdfIn PDF document text
    • http://soinjaga.ru/60163807321v7m05.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/LNgdcjg/tevewisa.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/VfheSfx/jobariwim.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/ijbNjjp/alicia_quatermain_2_the_stone_of_fate.pdfIn PDF document text
    • https://sinuvuliwazima.weebly.com/uploads/1/3/1/8/131871572/febara_gojipeleden_dozomiv_debatujikezin.pdfIn PDF document text
    • http://boxidodo.22web.org/79414014895.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ravigokabuf.rf.gd/52652866577.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/examples_of_theme_in_literature.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/87543822800.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE786 5212 bytes
SHA-256: 8f54a4f647c917159b6355342c1022a4d3cf45ab93631cbeb5e903a5082c8051
font_01_sfnt_off0000f950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF950 11116 bytes
SHA-256: 420685c86a023b13f87e1963bf59bf1bb0cbce39cbc07e7aa438f6dc34d26566

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