Malicious PDF — malware analysis report

Static analysis result for SHA-256 b717fce1567f5c3c…

MALICIOUS

PDF

71.7 KB Created: 2021-03-14 22:17:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 57e963185c56824883535bc6425f710b SHA-1: 22a858769d1946f2f30d6451fa97ad70fa1207f6 SHA-256: b717fce1567f5c3c77e39bd4b2684ee77afc7e86536ae8f3fdc164e73beb9f73
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable domains and are indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or redirecting users to malicious content. No scripts were extracted, but the presence of numerous suspicious URLs points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+are+some+similes+in+the+book+wonder In PDF document text
    • https://cdn.sqhk.co/bamebuxi/iP91Chd/xabami.pdfIn PDF document text
    • https://tebizojejifijof.weebly.com/uploads/1/3/4/5/134589629/c08265.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/what_is_pilot_arc_on_a_plasma_cutter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466153/normal_6016e2dec4a58.pdfIn PDF document text
    • https://cdn.sqhk.co/fewoxenovof/gicjd7s/1161173832.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501993/normal_600727bfceffb.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/jeiahgY/31320299014.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/11142037868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451563/normal_6036b7467e949.pdfIn PDF document text
    • http://majexifavel.scienceontheweb.net/discrete_and_combinatorial_mathematics_5th_edition_textbook_solutions.pdfIn PDF document text
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/32042.pdfIn PDF document text
    • https://nefupoxuwuridek.weebly.com/uploads/1/3/4/7/134747690/tasomotefe.pdfIn PDF document text
    • https://fojozotewimoko.weebly.com/uploads/1/3/5/3/135324817/xabilejesowajosik.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/aSIG0je/12030763455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481990/normal_604b466785aa4.pdfIn PDF document text
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/1595227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379614/normal_6048c41751cd2.pdfIn PDF document text
    • https://sotasoniwolog.weebly.com/uploads/1/3/1/6/131637806/4c8e6e79fbda.pdfIn PDF document text
    • https://masezinonorokun.weebly.com/uploads/1/3/4/6/134685416/zibiwo.pdfIn PDF document text
    • https://cdn.sqhk.co/mitukutowum/jf4hehh/2020_can_am_defender_hd5_specs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_d4c845384771462b9b28ca70bfec29f1.pdf?index=trueIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_d5da48e3cf204ab0918ba7ba1d2633e2.pdf?index=trueIn PDF document text
    • http://kipazafar.atwebpages.com/ronini.pdfIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_c6016cd2a739489fbb07f1ac72d2cf02.pdf?index=trueIn PDF document text
    • http://nodikaduf.onlinewebshop.net/accounting_and_finance_personal_statement.pdfIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_18cf19b63e2e4f65819288cede1255bc.pdf?index=trueIn 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_off0000d92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92B 5376 bytes
SHA-256: bb4524511a99152ee10b2c2395a34a1d4afb95ad6029ec3d1690eaf0bb7eceab
font_01_sfnt_off0000eb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 10608 bytes
SHA-256: 4f9f49ca9163e176f497693d81f65620fd372e7317c4559e0a0f83f06710fb8d

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