Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62231ec4a1fd570…

MALICIOUS

PDF

84.1 KB Created: 2021-04-02 10:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d3c016d4be03ca9a490dbc15d556d670 SHA-1: d1e9ee63c3d98875ea161956e461f5659cd261b6 SHA-256: e62231ec4a1fd570b5ce6fc52b79f21d035508f491b240d696a40f70973c90da
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting it is part of a link farm designed to generate traffic or distribute further malicious content. The document body, though heavily obfuscated, appears to be a lure related to song lyrics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/strik?utm_term=dirty+christmas+songs+jingle+bells+lyrics PDF link annotation
    • http://wujejejifi.mygamesonline.org/jesewejatogovajeno.pdfIn PDF document text
    • https://derifopo.weebly.com/uploads/1/3/4/4/134490925/bejodenu.pdfIn PDF document text
    • http://zazorin.scienceontheweb.net/neverending_story_horse.pdfIn PDF document text
    • http://fidafevemikiwe.mywebcommunity.org/ottlite_desk_lamp_costco_canada.pdfIn PDF document text
    • http://natur-green.fun/4480878332as8xt.pdfIn PDF document text
    • https://nejuxudukekiti.weebly.com/uploads/1/3/0/8/130874136/vevakasobami_sepadapowus_kofimaf.pdfIn PDF document text
    • http://fortuneo-enligne.com/how_to_put_a_quadratic_equation_in_vertex_form212ar.pdfIn PDF document text
    • https://kadezejuvi.weebly.com/uploads/1/3/4/6/134603763/segoxitugu-rosata-logalejovafudez.pdfIn PDF document text
    • http://getyourscore.info/pobegukubovugopuzedulw7n4m.pdfIn PDF document text
    • http://wapadax.scienceontheweb.net/autismo_en_nios.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/75014ecc-4e9a-41fe-8bb0-d470b3511d45/kiwitopedijeweguve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e01520f5-0bb8-4ec3-9a68-2b470c8fa521/daberasafalijeki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1bbd22f-570c-4c9c-b453-82904341d0fc/best_commodore_64_emulator_android.pdfIn PDF document text
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_7a574cb0d9894cd1b23d00913953a9c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc65124c-f400-4669-a5e1-f0163132eb3c/54892997577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec498e07-65a1-4882-812b-5dc77c37e54b/butefififiribobem.pdfIn PDF document text
    • https://d12d056d-c16f-42d2-bb36-b12dbd13f8e5.filesusr.com/ugd/a2005d_d3f5a91e5a234a619aae8a4e5f17f5a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1199fbc-7acf-4111-b81f-558afef42a0b/ccrn_study_guide_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40b0d31e-5d50-4389-a7ad-2dbb2826db5d/dikekekilesapilinebi.pdfIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_3ea7e9674df549efb2212eeca7d7639b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/75d094f9-d714-4825-b6fd-4709e3208a82/graco_snugride_30_snugride_30_lx.pdfIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_a9707596559c48f8a6b581a7d04db4bd.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_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 5528 bytes
SHA-256: ae80d6d4e64a6f8870f45a0bb88aa1d84b3c91d0d0c1c9fb85f1c675abfbb696
font_01_sfnt_off00010674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10674 10628 bytes
SHA-256: bf59866a93a2776c31c60df25830980577769a2cf1983e5cf3276e3c90c69e6e
font_02_sfnt_off00012ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC0 16312 bytes
SHA-256: bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939