Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66334e647944aa4…

MALICIOUS

PDF

76.8 KB Created: 2021-03-09 18:27:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f7bba36c5252669b01fdafee8333326f SHA-1: bf101f51e9a5480d9eba518bf44f6a3cde9c5e32 SHA-256: d66334e647944aa4f0cf6bae29a6243097b49b3b58dc029c482ee3cbeba8bc80
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/strik?utm_term=chamberlain+liftmaster+professional+garage+door+opener+remote PDF link annotation
    • https://cdn.sqhk.co/toviranevu/ifo9er5/xovimeziso.pdfIn PDF document text
    • https://cdn.sqhk.co/selusujava/dshdxDg/amazon_truck_driving_job.pdfIn PDF document text
    • http://usacreditmonitoring.info/the_firm_book_reviewt98xu.pdfIn PDF document text
    • http://qunit.space/446114821469ks8f.pdfIn PDF document text
    • http://fibisazorowax.mypressonline.com/aerosol_spray_paint_sds.pdfIn PDF document text
    • http://docita.fun/bestway_filter_pump_58381_instructionsctofn.pdfIn PDF document text
    • https://cdn.sqhk.co/xorilulog/GgdijTe/zubusemixe.pdfIn PDF document text
    • https://cdn.sqhk.co/jazepoxamib/Mgeauhj/98471194118.pdfIn PDF document text
    • http://shoppermarket.online/81153157945gmp5g.pdfIn PDF document text
    • https://cdn.sqhk.co/goxepijikun/vvnhegh/bebelufudezazudu.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/avogadro_s_law_sample_problem.pdfIn PDF document text
    • http://avtoshkola-region26.ru/23041642682ly3a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_daa3c582715a46e082bfd63806caa446.pdf?index=trueIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_c8352cc4c4974120b14759011583ed6d.pdf?index=trueIn PDF document text
    • http://fuvuvadut.onlinewebshop.net/lord_of_flies_book_movie.pdfIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_e1866d6c0dbe43379af811c002e08416.pdf?index=trueIn PDF document text
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_1efa426045bb41b6ad2064912e70fbea.pdf?index=trueIn PDF document text
    • https://68f06c25-eb64-4e0a-94e3-a0e33e610147.filesusr.com/ugd/463ace_3d6dc9b6cb0f4befb0d037a074001bac.pdf?index=trueIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_a1adfa71611547a1ba32a7c4080795f0.pdf?index=trueIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_3989e7f67a444f5abf885b8f9b3c8951.pdf?index=trueIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_6d38444c2d1448e19ae07efe46c86909.pdf?index=trueIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_2b83fb2727a44b418b95eae462ff1294.pdf?index=trueIn PDF document text
    • https://e53c8fcc-339b-4d8f-83f6-44ddc8c6ace4.filesusr.com/ugd/1ea9c4_d59658e84aef47e59dc17314c1baffaf.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_off0000edfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 5500 bytes
SHA-256: f4ca21df0472718b247ef65ae8ff6297a1a78aa0bf452ae82a574eebc110bead
font_01_sfnt_off0001007c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007C 10764 bytes
SHA-256: 31bd97757a251815993abdd7ec9bb4f95db42e28a4e06b7f821c993bef7bfbe2