Malicious PDF — malware analysis report

Static analysis result for SHA-256 595bdd250e6a2bbf…

MALICIOUS

PDF

114.7 KB Created: 2021-04-12 22:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6fea96cd4e64949a2f9d4f51fd664b2e SHA-1: c216a5e5ba1fac49fd06a23a1e9cbd23aa9b24a4 SHA-256: 595bdd250e6a2bbf63fd3236a64caf8f6b1a2259699ed1ddce71929ff2c20fba
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 hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs are likely used to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/strik?utm_term=singer+simple+3223+bobbin+threading PDF link annotation
    • https://dunebuka.weebly.com/uploads/1/3/2/6/132682868/a4318336.pdfIn PDF document text
    • https://cdn.sqhk.co/sowodopevew/gehakjf/vurub.pdfIn PDF document text
    • https://pajodutakimileg.weebly.com/uploads/1/3/4/4/134474341/xusixebimip.pdfIn PDF document text
    • https://lodoxaravejow.weebly.com/uploads/1/3/4/7/134719504/duvekoladufe.pdfIn PDF document text
    • https://cdn.sqhk.co/bujiwamovul/djauijS/falls_road_animal_hospital_prices.pdfIn PDF document text
    • https://cdn.sqhk.co/tibidimewako/ifoijij/dragonpass_lounges_heathrow.pdfIn PDF document text
    • https://momigetufi.weebly.com/uploads/1/3/4/8/134876151/2397107.pdfIn PDF document text
    • https://logodorabep.weebly.com/uploads/1/3/4/7/134739314/ledunugixiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://db22a0a0-c6c8-4eb9-9878-037c50d93224.filesusr.com/ugd/e2b5b3_8d6c1801c9a24653b0d70ba1a421f976.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/lectio_divina_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/13552901282.pdfIn PDF document text
    • https://b66a6cc6-7028-4fd7-9d19-084b2b27c535.filesusr.com/ugd/4015cf_d8b7e208a9c4493a94f2bfe7de243010.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cca90712-87a5-408a-a688-07bf2d312139/mmpi-2_validity_and_clinical_scales_profile.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/rinikati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed455a64-83c5-4262-8056-d253cead36a4/como_se_hace_un_titulo_salvage.pdfIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_b252cba93eee496fa45501e49d4a07ae.pdf?index=trueIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_33cf2e74b12e46fdb35f40153b194822.pdf?index=trueIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_be97d7971aa14f0897a7e1100fe20f67.pdf?index=trueIn PDF document text
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_c7b63dcba83c409c8fb582358483b992.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/what_is_the_history_of_rheumatoid_arthritis.pdfIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_03d4fd56adee4d83bd82072151a9667d.pdf?index=trueIn PDF document text
    • https://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_a9e4004f31a7411e80d5c15ff41f2754.pdf?index=trueIn PDF document text
    • https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_74e9fd1ca5cd4b92ab3c9967650a7f19.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000163e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163E2 5912 bytes
SHA-256: 7c72cb3f5d99ca68c6d802614871ed40e146e0d825dc343bee301091a05fd376
font_01_sfnt_off000177ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177CA 15560 bytes
SHA-256: f389390f619746f64c5610029acf3e72dc9c7748ff6c92effe29846dfe41bcc5
font_02_sfnt_off0001a730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A730 16224 bytes
SHA-256: ebdedd40a891e12ef7469d8fc2cc81e6d0d0a1371ce723a5ef3a02054806fcbb