Malicious PDF — malware analysis report

Static analysis result for SHA-256 943cbcde6c2a938f…

MALICIOUS

PDF

78.9 KB Created: 2021-03-10 16:59:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 81d6776c0aeaca30f6f7f00e91c68767 SHA-1: 33cb6f712beebaef6ddeb4c1a7f128aeeb6a90e9 SHA-256: 943cbcde6c2a938f0baa3c91d0610f6adeb8c3eda98400418a9cd696f3405218
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9997

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://xajibur.ru/123?utm_term=facebook+banner+powerpoint+template PDF link annotation
    • https://zunenevalomedo.weebly.com/uploads/1/3/4/8/134855990/9439341.pdfIn PDF document text
    • https://dijavagom.weebly.com/uploads/1/3/5/3/135325372/9b1ca6d0b7a6.pdfIn PDF document text
    • http://arnautmebel.ru/how_to_say_hello_in_american_samoahqnn1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_603c493fb7bee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478670/normal_600740ebf3b62.pdfIn PDF document text
    • https://rikovikoxeko.weebly.com/uploads/1/3/2/7/132740842/03fdbb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5fd86c6bd3dfa.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/7_luck_vegas_free_slots_machines_gameskyd2m.pdfIn PDF document text
    • http://tesekal.mygamesonline.org/how_much_is_big_tom_worth.pdfIn PDF document text
    • http://meblik.su/zodomilolosukefippyfc.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/how_to_reset_pelonis_space_heater.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464871/normal_5ffa24003d28a.pdfIn PDF document text
    • https://rafowatixi.weebly.com/uploads/1/3/0/8/130874563/1dc567fc72c.pdfIn PDF document text
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/7994091.pdfIn PDF document text
    • http://hotita.space/212430992243xod2.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/8dc41175-7acf-4d69-9977-f2a2d3c933d1/mivalebexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3790020-70be-4da0-8945-42b4d691d37a/2005_jeep_grand_cherokee_laredo_stock_tire_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8798d7e5-9752-461b-a996-69eb65f70336/pivovufenukop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cbb48f6-897f-412b-b363-2fc5951a5855/33696234969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1606e13d-549d-4977-957e-ba23efcad130/can_sex_cause_spotting_in_early_pregnancy.pdfIn PDF document text
    • http://taberadajip.atwebpages.com/3843344894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c50d502-a279-4af8-abfd-fab9ad9fb302/bijakodanafokozorujiwa.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_off0000f8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AB 5152 bytes
SHA-256: 068569b3dcb8e4de6a131b991994b149427593806cd1c386e86b819a628cdfa9
font_01_sfnt_off00010a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A31 10508 bytes
SHA-256: 730ca684adab875172c4afc19ae155af2ecd3ded8c6d75e9186bccb417d1d744

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