Malicious PDF — malware analysis report

Static analysis result for SHA-256 9364c5e3eefc0149…

MALICIOUS

PDF

77.8 KB Created: 2021-03-11 01:41:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cfeefcfe0074160efbf3291161bb65f6 SHA-1: c58ed66b5ce122bcfd8199510f380aca32d2db18 SHA-256: 9364c5e3eefc01498c4b3387386231ef99f24c2b11330883b50d1865f6f7c324
194 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/strik?utm_term=juz+amma+surahs+audio PDF link annotation
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/dusumir.pdfIn PDF document text
    • http://tvoy-ogorod.online/how_to_remove_graco_swing_cover7zhrb.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/bayesian_network_in_artificial_intelligence.pdfIn PDF document text
    • http://innov-cis.net/billy_joel_vienna_piano_sheetknag0.pdfIn PDF document text
    • http://sberbank.services/how_to_replace_harbor_breeze_light_switchegbyk.pdfIn PDF document text
    • http://kepuxom.mypressonline.com/63571207781.pdfIn PDF document text
    • http://vekisonoloze.sportsontheweb.net/leading_change_adding_value_harvard_reference.pdfIn PDF document text
    • http://domsale.xyz/96078466190r8xqh.pdfIn PDF document text
    • http://lalat.space/the_good_place_season_1_episode_guidekgjct.pdfIn PDF document text
    • https://sizadomuwegemos.weebly.com/uploads/1/3/5/3/135335556/dabapimamumolipu.pdfIn PDF document text
    • https://siwuxamafovad.weebly.com/uploads/1/3/4/4/134489720/zimapoto_xoluzu_rakezifelubod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7ada34c-9c2e-4e18-80b3-e8a7c84f9168/64682577983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ecfb3e9-a0bc-40b7-ab63-1057f72e26f7/interview_questions_and_answers_for_nurses_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e56071a-7337-4f55-a99d-604e7d7c157a/apostol_analytic_number_theory_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4978a2ec-99d4-4935-a5bf-2360b12898b8/80105182006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a5ecbfc-d746-4a22-bfd5-a5a374763e1d/how_to_remotely_turn_off_your_router.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/025d6cf3-3829-4859-bc3c-99f9730013c0/48867483699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/331df085-83c9-43aa-b25d-45ee9e41d376/how_to_connect_ipega_9076_to_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1ea76d9-e1d5-4890-80f5-a5fcee11e63f/91611244034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dd3fdc6-d991-450a-8fb5-87c00024bfad/46638912144.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
    • 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_off0000ddee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEE 5072 bytes
SHA-256: 59b69ccafec638ad8ca17d7dfd53d9b6fc0751736387705edeb50f6dcd893e53
font_01_sfnt_off0000ef03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 10536 bytes
SHA-256: d346d59d26b8cd7f6797e1a41ac10505c289650fd3dabf555124668410ae5955
font_02_sfnt_off0001131e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131E 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501