Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a84b874261d3e43…

MALICIOUS

PDF

67.3 KB Created: 2021-02-16 13:00:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 59c209ec3f00a93f2562adcd0f1be767 SHA-1: c40c30a6622500070c3bb06c784d9ef7690589f7 SHA-256: 1a84b874261d3e432465ffc65d9f28de97a91eeb0514af4f7cc3a99850df6fcc
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the overall structure suggest an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/strik?utm_term=the+selection+series+books+1-5 PDF link annotation
    • http://seviregigaguz.22web.org/angular_6_form_validation_custom.pdfIn PDF document text
    • http://lasleymarkt.ru/o_que__capitalismo_informacional_tericok3xxc.pdfIn PDF document text
    • http://nashremont.site/legend_of_zelda_twilight_princess_guide1zy5w.pdfIn PDF document text
    • http://znalomstvavip.site/kirekuvujuziloxavrx.pdfIn PDF document text
    • http://zumikavu.22web.org/marathi_balgeet_video_free_mp4.pdfIn PDF document text
    • http://aarbuz.space/2151879510414hb0.pdfIn PDF document text
    • http://leftoutclub.com/college_algebra_5th_edition_beecherkvu6s.pdfIn PDF document text
    • http://geosen.net/long_division_with_exponents_worksheetufudx.pdfIn PDF document text
    • http://cmb-eco.com/kawufitabutiva4ijbl.pdfIn PDF document text
    • http://dutov.org/84532278617m2046.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/jock_foot_fantasy_free560c5.pdfIn PDF document text
    • http://walkover.me/sololearn_javascript_answersxqrsp.pdfIn PDF document text
    • http://mmmuuuue.space/sebovu41w4b.pdfIn PDF document text
    • http://legrand-spb.ru/vore_visual_novel2tsgt.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
    • http://kipenul.epizy.com/sudovawativivusetubajuruf.pdfIn PDF document text
    • http://jawikiluzejibe.epizy.com/handwriting_sheets_cursive_tes.pdfIn PDF document text
    • http://xofunuxemijowex.rf.gd/66353652367.pdfIn PDF document text
    • http://jibubifo.rf.gd/ionic_and_covalent_bonds_color_worksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02F 4828 bytes
SHA-256: a7e9a0811f9cd2b6357e7d86b78e285775136099b47d1468750a0816eb70dafc
font_01_sfnt_off0000d094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD094 9804 bytes
SHA-256: 34be4469490da4e740f30075725060ebf3dc181634e0421611dc89ad0b4857a6
font_02_sfnt_off0000f206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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