Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc969bf901626117…

MALICIOUS

PDF

76.8 KB Created: 2021-06-11 00:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1fd7f0cde00314b2875cf38a66881e8f SHA-1: 95961ceab87a2b8f06548d35371ea72d4676b624 SHA-256: fc969bf901626117f08ba135675a848e4d4c3dbdf0aa2a5ce29f8d61cf100544
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://crysiq.ru/pbw?utm_term=if+you+would+do PDF link annotation
    • https://nipazutilufap.weebly.com/uploads/1/3/0/7/130738662/840fec4e497a7a.pdfIn PDF document text
    • https://gimipozadifan.weebly.com/uploads/1/3/1/3/131380487/jofuzane_lagasogezaveto.pdfIn PDF document text
    • https://bipixexomalexu.weebly.com/uploads/1/3/4/3/134349320/tatixejuj.pdfIn PDF document text
    • https://zunatiwol.weebly.com/uploads/1/3/0/8/130815351/juwifexesotivi-dedapuw-gubuki.pdfIn PDF document text
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/ledujuwedesofabef.pdfIn PDF document text
    • https://bawusazatodopam.weebly.com/uploads/1/3/1/3/131378774/7824880.pdfIn PDF document text
    • https://xixurisegiwawaz.weebly.com/uploads/1/3/4/0/134012782/0e11bd4c841ca6.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/7a5a53d5-e94c-4b75-961d-dd7cc0c7b72d/kenmore_elite_dishwasher_replacement_upper_rack.pdfIn PDF document text
    • http://posonuxe.pbworks.com/f/temasavonigeveworasu.pdfIn PDF document text
    • http://lururefisu.pbworks.com/w/file/fetch/144658929/18398004074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/267fb8d3-4f96-40a8-9ee4-336e43662c03/what_is_the_best_software_for_animation_3d.pdfIn PDF document text
    • http://jawegele.pbworks.com/w/file/fetch/144670977/610519162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a651536-fec5-444a-add1-2cf74f4a1052/logitech_wireless_headset_h800_ear_pads.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2f95f28-ac40-4de0-af79-f5c58ff11c87/tesokerezudelaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9908f98-f80b-41f7-a0dc-d275e24360ea/rich_dad_poor_dad_cashflow_quadrant_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3a04c23-d8b0-4bab-b37e-753a2642fc8d/bosaxixafepo.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144423576/exercicios_concordancia_verbal_e_nominal_concursos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b571ada5-2cef-4e45-9ad0-18edc7165fbe/39778058321.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_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 4548 bytes
SHA-256: 8b0bbca4658c39ba24b161bb1b2cddd62c53c6a6508a303cba1c84839bc7489d
font_01_sfnt_off0000fef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF3 11544 bytes
SHA-256: c90943d7a272195beae273b3843c3f91e51e28881f3555414ddf990c603264e0

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