Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e9b96e341be723d…

MALICIOUS

PDF

73.8 KB Created: 2021-04-22 22:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f500cce470c943c61314a247cb156e82 SHA-1: 203377abfbda6645ebf56eb8127d2fbb32bb77a7 SHA-256: 1e9b96e341be723db3d4d41ec128f7e65bec9c0c5c5ecb1efc9e7a1dddd412d5
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are on disposable hosting, suggesting a link farm or SEO spam operation. One URL, 'https://zajinet.ru/strik?utm_term=tomtom+go+600+battery+not+charging', appears to be a primary lure. The document body is heavily obfuscated and unreadable, but the presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests the document's purpose is to drive traffic to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://zajinet.ru/strik?utm_term=tomtom+go+600+battery+not+charging PDF link annotation
    • http://zinefikitozozeg.sportsontheweb.net/prestamos_y_calcos_linguisticos.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/atifiZO/36100132395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421611/normal_5fdbdd348c265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469834/normal_601dd5eff3189.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/i2Ngjb1/apple_ipad_smart_connector_charger.pdfIn PDF document text
    • http://papawugamajube.mygamesonline.org/88149834714.pdfIn PDF document text
    • https://cdn.sqhk.co/visobipibe/GLihxBS/bombay_full_movie_hd_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/JjeibOy/fivestars_loyalty_pricing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450046/normal_5ff8b52a9c197.pdfIn PDF document text
    • http://zavolofa.mygamesonline.org/livro_energia_e_meio_ambiente_download.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/af1234b3-044d-40ea-8a98-d77e3c6e9ee3/do_walmart_employees_get_discounts_on_apple_products.pdfIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_48c20ac5cc9b459c97728ca04098ec5b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf313c60-93d1-4d48-b96d-881c6230cca5/gene_keys_activation_sequence.pdfIn PDF document text
    • https://1fae3a98-13b7-4b95-b1f0-1fbd1b7b0aee.filesusr.com/ugd/1da05d_a727c23992fb45748498994c2f6ca6a6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/020960c8-173e-442b-9534-a6de9c6989d0/56727270615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cc35ea8-6ae4-4859-baa3-018624c33cc0/bedosoxosusopexesev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/149171cf-47e2-4126-a8d6-0111cc0e6f81/how_to_draw_cartoons_step_by_step_for_beginners_slowly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfc98d80-221e-4dea-9c3c-d3670b8b70bb/15930260190.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf37b20b-7604-405d-8c49-71c2fc13310e/que_hago_si_mi_media_naranja_es_toronja_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a2ecf51-147b-4d0d-be7e-5b9a82c1dae2/96685933960.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BE 5492 bytes
SHA-256: e7a1d912a172f9266861d3129d5e78380630c22a2a4bc25ffbeebc42f2614a5f
font_01_sfnt_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 11176 bytes
SHA-256: 0da8b8db272bdb9486f57bd9b2fda32b52288612d0c8421e8a3dcb89fe6ed8c4

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