Malicious PDF — malware analysis report

Static analysis result for SHA-256 06183fd16b892fe5…

MALICIOUS

PDF

77.8 KB Created: 2021-05-30 09:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 79fe980a550ef28f5fe2cf29cd7ad122 SHA-1: ad0ac79357312d1574a9190dc4f0e5b8918186dc SHA-256: 06183fd16b892fe59ae2d568c3d810787a127172c3d88e990c95dacdb1020add
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous external PDF links, including one redirecting to 'zajinet.ru'. The document body, though partially corrupted, suggests a lure related to a "thirsty crow story video", likely a social engineering tactic to encourage clicks on the malicious URL.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?utm_term=thirsty+crow+story+video PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483335/normal_6019ca250b839.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476939/normal_600ebf513f8b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464877/normal_602743ca0dc2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_603fa5aec41e4.pdfIn PDF document text
    • https://xexasatokotubeg.weebly.com/uploads/1/3/4/3/134354060/favedaweg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490739/normal_6000bee745d63.pdfIn PDF document text
    • https://gawowulovo.weebly.com/uploads/1/3/5/9/135966180/loruxijijor-vexoxibeb-sitisolede.pdfIn PDF document text
    • https://lesinagin.weebly.com/uploads/1/3/1/4/131454304/f873e48bd18bb96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494673/normal_606720d3c4330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468837/normal_6065b2a86c1c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/66b7c957-0fa7-4c94-b9ec-5fab12a5dbe1/t_fal_deep_fryer_basket_handle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53884d89-f592-4f71-ac50-4865b718a55e/44704985854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f53b642-bfd4-48ee-b03d-c76dc87fea80/79941915445.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68823b55-828f-4d81-a62a-235be18ace3c/pamujenagavanomajakazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc56d1b6-7e37-4efe-be3c-03222736a174/sizuluvapigev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/386b0d0d-fc3c-471d-88b8-5d8cfd3ca8cb/69620407034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77e7477e-dc21-4711-9f06-fdb8271b0ee8/what_is_literal_rule_of_interpretation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c5f940e-d733-4b10-ae52-fca36b5a8fca/what_goods_are_produced_in_the_united_states.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea557c80-a2d6-4b55-8546-8cd505d23b22/kidemubexabadakipijobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05df61e1-95f3-4f73-92e1-8d6412c20e95/what_is_a_community_action_initiative.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b0545c7-a76b-4338-8053-eb4e770a1a29/modo_de_produccion_primitivo_o_comunal_duracion_en_mexico.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_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 4988 bytes
SHA-256: 9545231d40b25eed23ae79fa09b6963c57265c383367c9887e231d8bb8e2a1cb
font_01_sfnt_off00010173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 11620 bytes
SHA-256: ab42e9c0f21265f7c6d25b696cd64a3a05101cd7c1ed7645b259b8b93a2c9b7b