Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ff680bc48ce24c…

MALICIOUS

PDF

74.2 KB Created: 2021-03-25 10:49:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7a45783d7aaa76dec70c9e2942e0f9c8 SHA-1: 8803cfa27aa5f904015b87b2c8156bf78de702f1 SHA-256: b3ff680bc48ce24c99ff1522b4852768d9286dfd15b2252867b25176a725ecbf
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://maypoin.ru/123?utm_term=online+certificates+templates+free PDF link annotation
    • https://birupilanakok.weebly.com/uploads/1/3/4/0/134017156/310898.pdfIn PDF document text
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/2487141.pdfIn PDF document text
    • http://bu-markett.com/back_to_the_future_2_movie_download_in_hindi_mp47v7mo.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/29819783566.pdfIn PDF document text
    • http://rimarilomikozu.medianewsonline.com/jexumigadozaf.pdfIn PDF document text
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/rataxafinu_gazesi.pdfIn PDF document text
    • http://esmoney.site/tisiremovepewi1l5pk.pdfIn PDF document text
    • http://coolvdomaion.online/33774137408zwxzq.pdfIn PDF document text
    • http://inostrana.com/what_is_the_best_router_for_fios0huii.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_2a2342c72aae469fb5d54c8e07e5c408.pdf?index=trueIn PDF document text
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_95b5b9964572443db0df204910a0c500.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5683a36-2446-431e-9719-a92862420dc1/vuvojiluxugutowugimow.pdfIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_3d59ce90fc104125bba7766767bb2d9f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b7de147-1806-4265-b88f-5ec862ec682c/what_did_viking_tattoos_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49bfafb4-f4f9-4926-94b5-cb3d79520960/stan_getz__joo_gilberto_the_girl_from_ipanema_letra_espaol.pdfIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_58d7e81d57154b4db9451865d4847c1d.pdf?index=trueIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_f34e0afab951428f96b0980c50a44797.pdf?index=trueIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_779b86be2dca4ed5a6da61cfdd3e6c7b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d429dc8e-fbf7-4880-a14f-f1e93496e896/xasavizapola.pdfIn PDF document text
    • http://bozagasixafovo.atwebpages.com/73427813004.pdfIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_f63956e49a0c4f018fb09750ee32e094.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AB 5188 bytes
SHA-256: d8a2c1f4793a5476a4b30c331bd85bc69f5a5907051dcdfe53ccb578f2150444
font_01_sfnt_off0000f73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 10704 bytes
SHA-256: b8c32c767d220a3ac86d88e9a37418e9f087ec2ddd658c0076b8353e6a722a35