Malicious PDF — malware analysis report

Static analysis result for SHA-256 6afa62b5713d3e72…

MALICIOUS

PDF

74.3 KB Created: 2021-02-25 15:46:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 893b3a7ae0c903aa5ff1a0c31a46c1be SHA-1: 21caf3ef7b708188f0f390668092995eb0c2c358 SHA-256: 6afa62b5713d3e72fd3c653f674632e965be752103335df5be8db64b79cf8c78
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://druttle.ru/wix?keyword=clash+of+clans+guide+for+beginners PDF link annotation
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/zexozazejej-kowewilavafegi-fikitaxu.pdfIn PDF document text
    • https://rofikilidoxomuk.weebly.com/uploads/1/3/4/0/134017179/58e404d.pdfIn PDF document text
    • http://experiment.website/416769172a587b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411696/normal_5fdaef9f480f3.pdfIn PDF document text
    • https://sinuvuliwazima.weebly.com/uploads/1/3/1/8/131871572/febara_gojipeleden_dozomiv_debatujikezin.pdfIn PDF document text
    • http://remontvorot24.com/coloring_book_chance_the_rapper_release_datelc805.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381980/normal_600223334094c.pdfIn PDF document text
    • http://imedo.ru/855322687056ta05.pdfIn PDF document text
    • http://cetakchantek.com/sintomas_de_alcalosis_metabolicas057g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416796/normal_602c96a093351.pdfIn PDF document text
    • https://wuwogijate.weebly.com/uploads/1/3/4/8/134886767/pukowese.pdfIn PDF document text
    • https://fisuzawagowesus.weebly.com/uploads/1/3/1/8/131857314/0753d676317.pdfIn PDF document text
    • http://repaircreditscore.info/mozusewalaket8ci.pdfIn PDF document text
    • https://wufewevaso.weebly.com/uploads/1/3/1/4/131453291/3372f969f.pdfIn PDF document text
    • https://molawakipo.weebly.com/uploads/1/3/1/3/131379716/wegit.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/how_long_to_cook_sweet_potatoes_whole.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490534/normal_5fdb5c4febe96.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_off0000e65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 5328 bytes
SHA-256: f35d9a20a2acc7170383fed9714e89bb397d75e5ff8a9211c57483a65d02d5e4
font_01_sfnt_off0000f86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86C 10408 bytes
SHA-256: 4ca014dd27cb81e18abcef4237b9795892e6e5c814ab5075420ff6d5ed18819d