Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f84748c70e1e373…

MALICIOUS

PDF

78.1 KB Created: 2021-05-27 08:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a7b5cd5dcc0a3204f431a3460a600a8a SHA-1: 5a95f08fb696e3fff66830cc12a7a48a0408ad2e SHA-256: 7f84748c70e1e373d264e4f89130746cca948bcecb607adf7526f4395d0eaf21
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://nipisod.ru/strik?utm_term=what+is+the+book+after+dog+man+brawl+of+the+wild PDF link annotation
    • https://vubufuzavedorav.weebly.com/uploads/1/3/4/7/134766784/xigokukuzifupisak.pdfIn PDF document text
    • https://tusutaxuwipafu.weebly.com/uploads/1/3/4/4/134403355/6901723.pdfIn PDF document text
    • https://pozuzabo.weebly.com/uploads/1/3/4/4/134432083/780bd4aed638.pdfIn PDF document text
    • https://gexemuxu.weebly.com/uploads/1/3/5/3/135394015/9c28dbbc372.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495050/normal_5fc93aff135bd.pdfIn PDF document text
    • https://zimuwinosozenuj.weebly.com/uploads/1/3/0/7/130740464/c3f0e62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389603/normal_60541482c2631.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454825/normal_600fe12bdd97d.pdfIn PDF document text
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/da32b3eb92add2c.pdfIn PDF document text
    • https://fimibiwuru.weebly.com/uploads/1/3/2/6/132696060/208fcb780.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/d467b784-9e97-420e-b90f-de235a95b779/keurig_b140_descale_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c8db41c-254a-4e8e-a313-239c730cc9ef/goganiwisesivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb75f8b1-1605-4bb6-8b4d-9f747d5bcae0/reasoning_and_military_aptitude_test_for_afcat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcdb321c-5ae6-4918-9d45-384d8344f09d/esttica__mecnica_para_engenharia__r.c._hibbeler_2011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc3a92df-ae7b-473c-a1e9-5e33e3f8672c/55273655222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53088705-5274-4396-b8f5-131070b65d85/87799254463.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7405de9-b6b3-45ef-819d-02f75d665834/sinemagexepikawikijumux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02267cf4-3b7c-4800-97db-bd92ae0c9c14/does_usps_have_customer_service.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 5632 bytes
SHA-256: 3abe6f093be0a74ffaa4477a7c11e3f16468d304df1309a5ca8ae3e21b41e1ea
font_01_sfnt_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 11104 bytes
SHA-256: 2f6c51c311e17ea4e89026afc85625a93e0fb29f60c978cf9cf651862cfd71bb

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