Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2088ecc50ad22c5…

MALICIOUS

PDF

96.2 KB Created: 2021-02-10 04:29:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e2d8d45d6af0f96c26e6cd8f87136ae6 SHA-1: 277757c4e35dc01fad4af02ae10378696532be2b SHA-256: d2088ecc50ad22c563d2f0899a2b51ef722e32d8273fa7ddab2842c637f78ce1
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://jacksth.ru/wb?keyword=biologically%20important%20molecules%20worksheet PDF link annotation
    • http://bazazodagipaju.22web.org/xujenir.pdfIn PDF document text
    • http://natlab.ru/les_bonnes_pratiques_de_fabrication_dans_l_industrie_pharmaceutiquehgmm6.pdfIn PDF document text
    • http://zipogagu.iblogger.org/98408339421.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/pixel_car_racer_unlimited_money_apk_download79n7c.pdfIn PDF document text
    • http://freshnatur.fun/synonyms_worksheet_with_answers_for_grade_3ru5s4.pdfIn PDF document text
    • https://guwevene.weebly.com/uploads/1/3/1/4/131437413/gimurixefi.pdfIn PDF document text
    • http://1freedom.space/bigalulimafth709.pdfIn PDF document text
    • https://somirurawepaf.weebly.com/uploads/1/3/1/3/131381963/7658fe.pdfIn PDF document text
    • http://stal-kemerovo.ru/rush_limbaugh_radio_stations_californiagrz4k.pdfIn PDF document text
    • https://wigeludob.weebly.com/uploads/1/3/1/6/131636858/babudedakunomop.pdfIn PDF document text
    • http://all-host.site/lutoredorixukefe0ckx7.pdfIn PDF document text
    • https://zajadibagaku.weebly.com/uploads/1/3/5/3/135341716/kisuzetesa_tumup_pibibupisajubo.pdfIn PDF document text
    • http://a-trvl.ru/jipuzikawezutufelup7w67n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/ajax_form_serialize_post_php.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12001 2864 bytes
SHA-256: 9117bbf316fc2ea3b6e817c786b4239c6e639bc9bbc85041159577d557ec1aa5
font_01_sfnt_off00012a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A31 5536 bytes
SHA-256: 108f9e0a20343f3cde16960ee8dc309b216a14d49746b6cb90f3d437c01f2d60
font_02_sfnt_off00013cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF0 11516 bytes
SHA-256: 92071ad6e818f8a0bcc40c4db45b63c08cbe3aa504ba5ae7f75d32b7c85c5b56
font_03_sfnt_off00016478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16478 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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