Malicious PDF — malware analysis report

Static analysis result for SHA-256 037bdd6272aa58b2…

MALICIOUS

PDF

81.8 KB Created: 2021-05-04 01:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ce54c071c12a2d9e0e4ed07b20b740b1 SHA-1: e9e339f42accb260ca25fce3f3ab784825f9e77c SHA-256: 037bdd6272aa58b2fa31583f48a5728ab9c64a2ee05de72c92c8cfbfdaa8521f
186 Risk Score

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 0.9958

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://bologen.ru/strik?utm_term=streetcar+named+desire+blanche+light+quotes PDF link annotation
    • http://vuvabadiredowa.getenjoyment.net/5322591985.pdfIn PDF document text
    • http://dusofigubil.iblogger.org/53484643888.pdfIn PDF document text
    • http://wofirulufe.iblogger.org/4249962832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417531/normal_6013a2eb22d0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_604333fa10c57.pdfIn PDF document text
    • http://fafizaso.iblogger.org/besame_mucho_sheet_music_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481170/normal_600da70bbc74a.pdfIn PDF document text
    • http://ninuxalezopo.getenjoyment.net/how_to_deal_with_fear_of_intimacy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486971/normal_6040ba3673c7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455886/normal_60469b37bf271.pdfIn PDF document text
    • http://fekosuse.getenjoyment.net/63519587768.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jokajejuti.atwebpages.com/township_plays_athol_fugard_download.pdfIn PDF document text
    • http://nabunuwo.epizy.com/barasupeseturuxafibe.pdfIn PDF document text
    • https://f2f8a3c9-3ea7-4a25-b7e2-3e2749f32899.filesusr.com/ugd/f0e51d_25aadce20ee64409b880bd648bb9e192.pdf?index=trueIn PDF document text
    • http://zoridod.epizy.com/passiflora_alata.pdfIn PDF document text
    • http://lawigut.rf.gd/elliptic_hyperboloid_of_two_sheets.pdfIn PDF document text
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_46536fa1718d4325aa62d30e31da0d06.pdf?index=trueIn PDF document text
    • https://83662c7a-80c1-4e94-b5a4-3df479670d58.filesusr.com/ugd/27be29_1ad4e05c5bb2471189bd98b0974018d1.pdf?index=trueIn PDF document text
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_2bab042c6f134644ae95b56ca13168ed.pdf?index=trueIn PDF document text
    • https://c5b3e1fc-3b55-407d-a8d9-2bfa6c9015c1.filesusr.com/ugd/6df244_b568a15354334051be671aa0af9900e2.pdf?index=trueIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_df4e4548b2e2450d8cde97a602f98526.pdf?index=trueIn PDF document text
    • http://dusozizogotudim.epizy.com/ffxiv_dragoon_quest_guide.pdfIn PDF document text
    • https://849bdae7-2456-4570-9e2a-fc769e7e49ad.filesusr.com/ugd/2074c9_05f4ceb6353342faab52c0733eaeb175.pdf?index=trueIn PDF document text
    • http://bigofufujenu.epizy.com/13323811759.pdfIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_d56783fee5764a14a52ad0da9370c1b8.pdf?index=trueIn PDF document text
    • http://vitafunajubala.rf.gd/76152855141.pdfIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_1a17b4ab89e3489ca4a29820014ade73.pdf?index=trueIn PDF document text
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_c27556c17de24a519fa035637b3ed906.pdf?index=trueIn PDF document text
    • http://femasusatatovet.epizy.com/79165470181.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_off0000ff72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF72 5720 bytes
SHA-256: 457be89353e98374281b8eeee9d4f480176b45f73a27749b7efed73471370635
font_01_sfnt_off000112ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AE 10836 bytes
SHA-256: cedee31691e4248265d2d78e853f0186d25b0782b2da7a5c729f61e9239be676