Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe3b42041c3a272e…

MALICIOUS

PDF

79.1 KB Created: 2021-04-09 06:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c26c5bf7dbe7b6876c74e34bf727bd53 SHA-1: 9380835a5cae9d721b061f58665e92a79b6f9022 SHA-256: fe3b42041c3a272e8c82028c6991888eee8e242e91af7f8a575d6a8f49dea148
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 0.9991

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=algebra+lineal+schaum+pdf+gratis PDF link annotation
    • http://rineset.xyz/how_to_replace_wii_drivejcuhe.pdfIn PDF document text
    • https://pabelazulutibus.weebly.com/uploads/1/3/1/0/131070827/tetopemas.pdfIn PDF document text
    • http://raicen.com/why_does_my_pressure_washer_pulsatelxxfz.pdfIn PDF document text
    • https://kolenogu.weebly.com/uploads/1/3/1/8/131871799/xazurejawatut.pdfIn PDF document text
    • https://tekofudarazot.weebly.com/uploads/1/3/1/3/131381521/1166325.pdfIn PDF document text
    • http://ses-paypal.com/how_to_make_nautical_knot_coastersbl5b0.pdfIn PDF document text
    • http://changepass.online/wes_anderson_screenplayh5fib.pdfIn PDF document text
    • https://piwozasemoxusi.weebly.com/uploads/1/3/4/3/134378412/duvowix_forubovir_siriluz_sofovuperafarix.pdfIn PDF document text
    • http://semarogejej.iblogger.org/96234563045.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://numorajigot.epizy.com/kuvolu.pdfIn PDF document text
    • http://xoziviriwazobe.rf.gd/piragua_reprise_in_the_heights_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/center_of_gravity_lab_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22a16bfb-7916-4705-bfa0-6065f95e7c85/jusoruvupegevawavibutituk.pdfIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_2261165fe7be455386904d5c592eedc8.pdf?index=trueIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_458ddb268633499c88f7c5628992d877.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xisefowu/6230642258.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/do_you_have_to_have_a_college_degree_to_be_a_vet_assistant.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/bhangra_gidha_punjabi_song_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c49038c1-6d77-46b1-88b1-e3291136a05d/nepofosut.pdfIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_601d88a291fc4306b623ced5372b309d.pdf?index=trueIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_19d177ec22f24fcd976f9fd15cc4e65c.pdf?index=trueIn PDF document text
    • http://lojarine.epizy.com/banking_and_finance_project_work.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_40384517ead447c9a90e8a4abe3c953a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dusined/bodebikamidamitapa.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_off0000f3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 5700 bytes
SHA-256: 65a3605be655e982e1754cacf2694a9900bab6096facf7aa0b1f1755967e06bf
font_01_sfnt_off000106ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FF 11924 bytes
SHA-256: 2e20912fc2af5ccc50cbb4b7c42d50025092d00733a64a889efba2ad70ff7f5e