Malicious PDF — malware analysis report

Static analysis result for SHA-256 1543331295b1dade…

MALICIOUS

PDF

80.7 KB Created: 2021-04-05 15:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6c7d8b7d32d42f843498dc30fc9e1477 SHA-1: 5c546108d06538a1fe86f1acef9bf3db4ba9f1b2 SHA-256: 1543331295b1dade7c428641f857d14aee6de2767e4735ea64dbea235cb0aac9
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/123?utm_term=using+congruent+triangles+answer+key PDF link annotation
    • http://vevaxogejaz.scienceontheweb.net/john_deere_310_b_backhoe_service_manual.pdfIn PDF document text
    • http://optamorem.com/pewdiepie_tuber_simulator_hack_onlinex1jsb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450728/normal_5fd7db97d9672.pdfIn PDF document text
    • http://orbitan.fun/difference_between_gmp_and_cgmpm7zrf.pdfIn PDF document text
    • http://zoxuruje.sportsontheweb.net/ibps_rrb_2020_notification_bankersadda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393197/normal_6000fe6a8a958.pdfIn PDF document text
    • http://qlemelest.online/jaxajubadisolixobufis5hhv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_a213079fbcc44ab5bd7e88e13ccadd19.pdf?index=trueIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_45b4b606b4a94ba88c799c782084695b.pdf?index=trueIn PDF document text
    • https://fb3efafe-1b0e-41a1-9434-8bf556110c4a.filesusr.com/ugd/de5e41_c918520f58914d809a778e3939038e6f.pdf?index=trueIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_39206c7a65e64b14b88a4a9a28f12e00.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f698f165-4b71-44fd-a4cf-750cd2e9062b/asus_rp-ac68u_quick_start_guide.pdfIn PDF document text
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_991addcc1bcf4cbca11cd93c9826f977.pdf?index=trueIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_10c14c1f211d4976a2da61a174f98441.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f5c46bf-163a-40cc-91c9-159608a9e514/cobra_spx_5500_review.pdfIn PDF document text
    • http://tibutariwu.myartsonline.com/b._sc_mathematics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3344cb21-3b16-471b-9139-1d10a020f518/sample_house_rent_receipt_format_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3b503b7-a2ae-445b-8ef6-4ac50930e893/breville_juicer_je98xl_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50657bbe-8f45-444d-9b3f-0a4f2d25507f/52271386424.pdfIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_8800b2f7691f49f48e7320255d456b9f.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_off0000e731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE731 5216 bytes
SHA-256: 6620ff6bd19521b662d76aa8dd6835970152ae9b54783361d26d21428366a68a
font_01_sfnt_off0000f91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91B 11460 bytes
SHA-256: 704a4cac70619c3f6e720491fdbc55e32b16502fe7c205a0de26e96f4eebf66c
font_02_sfnt_off00012047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12047 16168 bytes
SHA-256: b2ac67756ccb9a38f0303b1ba820cb5c8b4ab6133599e7fd07ad9e712984a954