Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c445b13a1940f4…

MALICIOUS

PDF

129.9 KB Created: 2021-04-02 15:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 81279551032fcd77cf4644c7da8ce93d SHA-1: 5260af00dceec7bbb394257723847668c421cc15 SHA-256: 96c445b13a1940f4d3fcb49f31eb91d868b9215305fe5c0c426897c880ee5fc8
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 0.9997

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://jacksth.ru/award?keyword=beijing+map+pdf PDF link annotation
    • http://dewisazovuvoxi.mywebcommunity.org/architectural_building_drawing.pdfIn PDF document text
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/zesunopomufapel.pdfIn PDF document text
    • http://talajudoxuxip.mygamesonline.org/consumer_psychology_definition.pdfIn PDF document text
    • http://lebepufu.mypressonline.com/why_is_my_dishwasher_not_cleaning_uk.pdfIn PDF document text
    • https://wimukevefom.weebly.com/uploads/1/3/0/7/130739067/6081738.pdfIn PDF document text
    • http://mofemaruwek.sportsontheweb.net/callan_method_stage_5_chomikuj.pdfIn PDF document text
    • http://liwadaxezaf.getenjoyment.net/le_bourgeois_gentilhomme_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jodofinefurow.rf.gd/catamenial_epilepsy.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_d0eeb13bd6104aa9abb6101ad3e9ae7e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1caefde-bd0f-4543-b532-267901f6e227/rezivigabazokuwel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6a2702-336a-4f24-8b77-31efcc3e5171/namijuzamofijerodij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b9548b4-6cb6-4475-8d00-065bbdba408d/manual_calculadora_texas_instruments_ti_30x_iis_exponent_button.pdfIn PDF document text
    • http://mosasawimip.epizy.com/zivapubokotap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a442351-9d90-4c27-9171-8aafd2739531/does_comcast_box_support_4k.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4db662ee-66fd-421c-aee3-0262cf7cfd78/john_deere_310b_backhoe_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7546b237-7a0e-4314-b6db-6c8f67d46810/zudunin.pdfIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_fc2ffa281e7c4613a3d273baa9d26207.pdf?index=trueIn PDF document text
    • https://4868a29a-6d77-448d-a9c5-bc5c6a1713c3.filesusr.com/ugd/060e50_bab0467da46e47a2a066a9dbdd2f51e0.pdf?index=trueIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_d00646fd98d24f44905dbcb940d8eb11.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e378eab6-7c07-4c48-97c3-3d9ba196a14a/44911511765.pdfIn PDF document text
    • http://jopiwutipav.epizy.com/telugu_emotional_whatsapp_status_video.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000194f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194F0 11952 bytes
SHA-256: 94c9244275522fdab97c3cd95dde7ff77c3bf42ddccab0a2b02375a03f790610
font_01_sfnt_off0001bbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBB0 5180 bytes
SHA-256: 06f786bb2a63d51f4e8feae3649fc818f98bdde9c93a8dcd387011fe0ff7fd5b
font_02_sfnt_off0001cd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD4D 14468 bytes
SHA-256: 7ff7af8c1bfe20e573ce8a87406d66b288cade4d346c9173175c72bcc05e5cd3