Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f41519735c9801…

MALICIOUS

PDF

62.7 KB Created: 2021-02-18 02:03:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 34dd98b3bacff54fc3698199d151ab78 SHA-1: 8424458e578dcf3f7381d4fb0f97778c4613a61e SHA-256: a2f41519735c9801bea7d9f8b22358990b76dea4a38e9a3e65adfe8422b7290f
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to a 'furnace manual', suggesting a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=york+stellar+plus+furnace+manual PDF link annotation
    • http://sfr-webmail.com/cute_baby_animals_images_wallpaperermzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487916/normal_5fd8d941419d8.pdfIn PDF document text
    • http://endi-itali.space/zajilowerenujonizogoncmynb.pdfIn PDF document text
    • http://visatog.22web.org/ditepuserexaxafofifoxeso.pdfIn PDF document text
    • http://ing-cliente.com/worijumakigofomfqxeh.pdfIn PDF document text
    • http://lovepositions.info/35793125115vnwst.pdfIn PDF document text
    • http://white-x.fun/los_ojos_de_mi_princesa_2_descargar_gratis_completob5qlt.pdfIn PDF document text
    • http://fallofelin.online/vekuvadijawo22yl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381105/normal_60004a14a5f4f.pdfIn PDF document text
    • http://mnogolidov.xyz/zafomerowizyaxc.pdfIn PDF document text
    • http://vifepixakusuped.iblogger.org/jostens_yearbook_cover_template.pdfIn PDF document text
    • http://maxefeb.iblogger.org/can_you_convert_analog_tv_signal_to_digital.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/ccma_arbitration_award_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/kiged.pdfIn PDF document text
    • http://felobiziwikegu.rf.gd/homeready_income_limit_changes.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/mafamamutogefedomatike.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_off0000ba46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA46 5184 bytes
SHA-256: 60645e00623ff9621a862ef1a6a82d1dcbe4b7013f4caf283aacb1576094aaa9
font_01_sfnt_off0000cbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDC 9940 bytes
SHA-256: f044ff69eed8daa04fb1587fb9d788021c1f3d47a2c17498c75908d44de25a6f

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