Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b28daaa4c1182d…

MALICIOUS

PDF

79.8 KB Created: 2021-03-17 20:53:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 431ce0a4411ca4e64de70cd5bd8cb2c5 SHA-1: 6e78dabf65b6eee12b71a18d0333847a078016c8 SHA-256: 33b28daaa4c1182d828f2d10e9ca748e9b1ef7f7d65ad19f9281334c0ba481ef
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are on disposable hosting, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the document, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://maypoin.ru/123?utm_term=video+editor+application PDF link annotation
    • https://runuwafulisejet.weebly.com/uploads/1/3/5/3/135337902/melefokitiwez.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/fitbit_flex_3_straps.pdfIn PDF document text
    • https://kufoxigokutef.weebly.com/uploads/1/3/1/8/131856815/jopul-zogawe-fazemeg.pdfIn PDF document text
    • http://remaweg.22web.org/80402857292.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/bergeys_manual_of_determinative_bacteriology_9th_edition_free.pdfIn PDF document text
    • https://fujokexa.weebly.com/uploads/1/3/5/3/135304253/6985275.pdfIn PDF document text
    • http://mixezitubut.mygamesonline.org/the_power_of_kabbalah_free_download.pdfIn PDF document text
    • http://kogemotuju.getenjoyment.net/why_do_certain_websites_not_load_on_my_computer.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/74592884160.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/jonora/zaninovufirozitiso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5ecc7db-6fca-453a-a4ca-484398b03864/waxomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3634753-7e1e-48dc-a2cc-8322d7184664/54880699901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a6d0cfc-bc1a-4fb5-a34b-295a8e6d1410/kifowakewoviwenuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cda24e3-8df4-4ec6-9b70-af632c49101c/20400153717.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/how_to_convert_delta_crib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96f23d03-5b4d-4023-849c-723e78ab2e67/tawoludonujilutipiraletu.pdfIn PDF document text
    • http://fapaxemawa.rf.gd/congressional_research_service_report_for_congress.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/video_converter_software_free_pc.pdfIn PDF document text
    • http://torisesajew.rf.gd/blood_in_blood_out_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/baal_veer_ka_photo_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/pukidabekito.pdfIn PDF document text
    • http://toratolobojede.rf.gd/6760659933.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_off0000fc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9A 4856 bytes
SHA-256: 8d93537ef75cd70a2addf9669524c8db16da8c173db0581a4dfe59e4932354aa
font_01_sfnt_off00010d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2E 10884 bytes
SHA-256: 108fdaa6dd65fa89bee5f03c367394f8c1268b138e2c26169d03eefb53519013