Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf07684cbdbd2ea…

MALICIOUS

PDF

122.2 KB Created: 2021-03-15 20:00:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7374358ff9c8d3238fe37c82fea59058 SHA-1: 520d570bf89128d6631d4656615be85b7b894736 SHA-256: 9bf07684cbdbd2eaf3a063adea1d4e021dbce32cc9d450d2b17415601273cc66
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9999

Heuristics 5

  • 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 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://golowaki.ru/aws?utm_term=why+was+the+lorax+book+banned PDF link annotation
    • http://alifan.store/blank_map_of_canada_printableq7r66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482619/normal_6028b25f479b7.pdfIn PDF document text
    • http://kowuterada.mygamesonline.org/40023000070.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412415/normal_600036be1e753.pdfIn PDF document text
    • http://copyrighytsupport.com/61846387876yjsl7.pdfIn PDF document text
    • http://rolorutebu.sportsontheweb.net/88257125706.pdfIn PDF document text
    • http://whitetwo.space/zetenizejwfo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485807/normal_5fe866ee05785.pdfIn PDF document text
    • http://saroforati.medianewsonline.com/20637837925.pdfIn PDF document text
    • https://cdn.sqhk.co/riteximeras/BIshdL5/lobeg.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/jj0a6he/56667766800.pdfIn PDF document text
    • https://cdn.sqhk.co/numiwufeguv/NggYijt/buginawesig.pdfIn PDF document text
    • https://cdn.sqhk.co/wozejodes/BFuHEib/compliance_certificate_form_66.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/a7aa9dad-ac53-4ad6-b7fd-5740abbb7d26/memuxubozokepaxokepemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14ecbd62-3a2f-4b35-ac7d-c53851ee88e1/pikatonobapikorowis.pdfIn PDF document text
    • http://titugol.atwebpages.com/bless_me_ultima_sparknotes_chapter_18.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/is_jbl_flip_3_se_waterproof.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B1C 5392 bytes
SHA-256: 4a3b9d1946ac3ff8c57060acf00fff1ec1cf9a63d9663861bff98df3d92ab87b
font_01_sfnt_off00019d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D87 12096 bytes
SHA-256: be0f90e15a5b1add6f35c37f9f9566cadb77b103261cdbc0111214b69c564630
font_02_sfnt_off0001c55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C55C 16684 bytes
SHA-256: 8538aef193c39ac6298d67e2c5ebb3c060c5e5457cb9d30be834ce18389b48ed

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