Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db9a05192210190…

MALICIOUS

PDF

66.5 KB Created: 2021-03-30 06:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9776fda049135add39d3f45fc90ddd9f SHA-1: f5f7cf12f38e98fcf2cae8f3bfb36a4f0190daed SHA-256: 2db9a051922101901fd27f28739b46d53db0c4b96d170b236c0746d055c518c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests it's designed to redirect users to potentially harmful content or facilitate further exploitation. The document body itself appears to be obfuscated or corrupted, providing no clear user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://zajinet.ru/wix?keyword=understanding+music+jeremy+yudkin+8th+edition+pdf+free+download PDF link annotation
    • http://zenajok.medianewsonline.com/gewov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367310/normal_5fed9c59c6f54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393033/normal_602887ba5487c.pdfIn PDF document text
    • http://tuvosudokalidu.scienceontheweb.net/94550243913.pdfIn PDF document text
    • https://retumitoratosu.weebly.com/uploads/1/3/4/2/134234586/94943017d99.pdfIn PDF document text
    • https://viriparerari.weebly.com/uploads/1/3/5/9/135978168/7a95abd.pdfIn PDF document text
    • http://tonukavugu.mygamesonline.org/how_to_clean_honeywell_hcm-750.pdfIn PDF document text
    • https://taxikifa.weebly.com/uploads/1/3/4/4/134496463/f2453021de.pdfIn PDF document text
    • https://zukixemafeka.weebly.com/uploads/1/3/1/3/131398149/609c724e1e5f8f0.pdfIn PDF document text
    • http://jilavixit.medianewsonline.com/bozedamag.pdfIn PDF document text
    • https://masarifixi.weebly.com/uploads/1/3/4/4/134486171/tudezerif_suvezadebi_jukevepanu_jazudakifaka.pdfIn PDF document text
    • https://xofeboje.weebly.com/uploads/1/3/4/5/134584890/250fbc660d281e.pdfIn PDF document text
    • http://wowovamofuzo.sportsontheweb.net/47070817021.pdfIn PDF document text
    • https://masejufubalabej.weebly.com/uploads/1/3/4/3/134388341/gofugejiti-korevogep-suboset.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/fifuto/acronis_disk_director_home_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/totim.pdfIn PDF document text
    • http://dexizijisub.atwebpages.com/muvikudegelotebizifotin.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/pdf_animal_farm_analysis.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_off0000c42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42B 6088 bytes
SHA-256: 0602bf82783a1a688d90ec693997122ca03f2dcaf74b8597c031ed47c54da50d
font_01_sfnt_off0000d8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D8 9784 bytes
SHA-256: f15088ecc717cb679d62464b1721707aad640c47a26f31ec3d2155dfa6e56a52

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