Malicious PDF — malware analysis report

Static analysis result for SHA-256 947e16b3ac993a05…

MALICIOUS

PDF

78.2 KB Created: 2021-05-09 13:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5465d2778450bb55f07cb5e3c3542c37 SHA-1: 23d0baaefabc51b315111d24d63b8cab21b3b0a5 SHA-256: 947e16b3ac993a05620bcbbd3e39e4c1bfcd3c53b43c4a3829402aa10d32f0ec
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, which is characteristic of SEO link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the PDF structure suggest an attempt to lure users to malicious sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=nigerian+naming+ceremony+gifts PDF link annotation
    • http://levotavo.scienceontheweb.net/black_boy_book.pdfIn PDF document text
    • http://zosazufinur.mygamesonline.org/arturia_keystep_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481055/normal_6026bef8b8cad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426416/normal_5fde7eccb53c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367680/normal_605508db342c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447265/normal_603b305cad75c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426062/normal_605bb2f6a9de5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_bb97ec3177ed44e897b3fe190f7fa084.pdf?index=trueIn PDF document text
    • https://c941d99d-b58b-4215-81ce-525e38db2b81.filesusr.com/ugd/2dc4cf_50b13610a3f14994bd8bc6afb514e364.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/18ef1ee6-1903-4717-883a-a711b1b9387e/epson_wf_7520_ink_pad_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7c35cee-0a6b-4158-bf87-2a570456ecdb/how_to_fix_opal_ice_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b09cde-12a2-4b44-8273-1d6465cd908c/eye_of_the_beholder_movie_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d04d80b-8c95-4511-a699-fd1f2f63376f/best_ccna_200-301_book_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36b44a9a-0560-41ca-a7d5-c7d6367c2f68/how_to_remove_battery_from_uniden_cordless_phone.pdfIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_99bf70dd03b243f6aa23c6a518db64c2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/01bfb4ea-0de4-4cfd-9e7d-8d0c6806bd73/what_does_the_colour_black_in_the_uae_flag_represent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23c699c1-8ae5-4594-9870-699df1556930/83242574429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd189dca-6d77-41e7-af8f-65d7ebe8d290/10679911547.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aa43511-d4ad-489f-a6fc-e241c4847e79/garmin_dezl_not_turning_on.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_off0000f4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 5240 bytes
SHA-256: 7b5bee980d736107712a94ac0fa72ba773e6d56cd315423cf606d3bc9f105ae6
font_01_sfnt_off000106ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AB 11020 bytes
SHA-256: bd5901ed48a0d32dde5b749f45b164c1e7fa497213d619efe18afba9982f2d97