Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3f313171d00882…

MALICIOUS

PDF

79.4 KB Created: 2021-03-11 12:50:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7b8444127e1b3fb7247985aaf622b505 SHA-1: 53d9709f18601b7e26f3f40782ba637d06d43822 SHA-256: 9f3f313171d008827fb02a81f28ce08da0c2ceb64e7380a765bdbe86d2feaaa5
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 0.9995

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://jottigo.ru/wix?keyword=android+mod+apk+games+offline PDF link annotation
    • http://dmdmassage.com/apc_back-ups_500va_bx500ci_iecgvhxe.pdfIn PDF document text
    • https://xofudafitigo.weebly.com/uploads/1/3/5/3/135327781/926b0198.pdfIn PDF document text
    • http://heymama.store/catalogue_ikea_maroc_2020ghlfg.pdfIn PDF document text
    • http://becloud.website/ecoboost_mustang_auto_vs_manualttwc3.pdfIn PDF document text
    • https://xelexezeni.weebly.com/uploads/1/3/0/7/130740222/2742887.pdfIn PDF document text
    • https://xubivotalo.weebly.com/uploads/1/3/0/7/130775972/fovupoxavanuvos.pdfIn PDF document text
    • https://bafiredevidif.weebly.com/uploads/1/3/1/3/131384403/tizemel.pdfIn PDF document text
    • http://kasyanbeauty.com/bavikix51x0n.pdfIn PDF document text
    • http://veviwumifuvemuz.mypressonline.com/85393129540.pdfIn PDF document text
    • http://bbcua.site/vetixu81ew7.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/faa74dc5-208f-4a11-8f78-51db606dae7b/wemozoxegupaxuwasekebufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faca19c4-5c3f-4563-bb57-70a1088ec5ed/blood_bowl_second_season_edition_rules.pdfIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_86b92435145547e39b93dad3dbdc3c9d.pdf?index=trueIn PDF document text
    • http://givetupazowo.onlinewebshop.net/56689490658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a8b4510-5bff-4336-bb5d-5b74791d35f3/83274975121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe1f01e1-5cf1-4fc3-a4bc-8dc8e4bec4b7/89194231281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ddbceb6-11c4-4829-95ea-4f6460375ef2/dipiwazarajimowadodesal.pdfIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_79d416bf01af42bb9a3ef4c1c7876dcb.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_e5f42d69cbb64d028283a0480413b3cb.pdf?index=trueIn PDF document text
    • http://zitulogakapede.myartsonline.com/lugibamogogikojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd5385aa-141e-4c0c-99fe-8cff42dc82c5/edtpa_task_3_assessment_commentary_examples_early_childhood.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e92363fb-3880-45d7-b5f9-426b7ba679a8/how_to_hard_reset_a_dell_venue_8_pro.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_off0000e21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21B 5416 bytes
SHA-256: d3b373a14b5fe99eb381d93972d994e268eb8e26cb6e378df15e1a960c05311b
font_01_sfnt_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 10808 bytes
SHA-256: 606fc886eddc4c6c59aa99260826d6ad45969bea2f4cfe9ab1f6e42b21db65fd
font_02_sfnt_off000119ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AB 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67