Malicious PDF — malware analysis report

Static analysis result for SHA-256 945ff80e1a2ab72b…

MALICIOUS

PDF

72.6 KB Created: 2021-06-04 05:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: bbf1a175724844b72a64af61c96077a9 SHA-1: da8aa0a3beee32979c4830940299dd2b0e3f508e SHA-256: 945ff80e1a2ab72b079c9b170a390965fd84b47aa9f4656ff734058af050ef2f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and configured as link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious content.

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://philabc.ru/pbw?utm_term=what+size+deck+belt+for+troy+bilt+pony PDF link annotation
    • https://pofisuxix.weebly.com/uploads/1/3/4/0/134016862/benimuwarak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475406/normal_5ff7b7d3d32e5.pdfIn PDF document text
    • https://xepebujusu.weebly.com/uploads/1/3/4/3/134319702/936fa907ef3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450907/normal_60324e648c0af.pdfIn PDF document text
    • https://debasomi.weebly.com/uploads/1/3/0/7/130739769/fezubuwobi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://siwuromo.pbworks.com/w/file/fetch/144424617/78534742448.pdfIn PDF document text
    • http://tiduxikuve.pbworks.com/w/file/fetch/144421671/shadow_fight_2_special_edition_hack_mod_apk_android_1.pdfIn PDF document text
    • http://wemilamozede.pbworks.com/f/how_to_replace_hard_drive_toshiba_satellite_c55.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/049d8a25-5bd2-4461-b84a-37c9ed830b56/can_you_sleep_wearing_contact_lenses.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144564636/envoy_turkce_dublaj_izle.pdfIn PDF document text
    • http://refarumiba.pbworks.com/f/examen_bimestre_2_tercer_grado_primaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af9be01-17bd-489c-8d1f-f9417d539f30/kaspersky_security_center_error_connection_to_administration_server_failed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26260369-94a4-4b07-a171-37993a327ae4/how_to_practice_rhythmic_gymnastics_at_home.pdfIn PDF document text
    • http://pupowivala.pbworks.com/f/14088371806.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/f/what_are_the_functional_regions_of_a_neuron.pdfIn PDF document text
    • http://pulixojesu.pbworks.com/w/file/fetch/144507954/pojirefebedeperidikevov.pdfIn PDF document text
    • http://tovemubu.pbworks.com/f/real_book_b_flat.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_off0000dd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8D 5612 bytes
SHA-256: c61a889bf7d0ceb46baaa1fccd32b7a41938073cabfac8c6c6154536ea1ce4c2
font_01_sfnt_off0000f0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 10696 bytes
SHA-256: 1868394a4f4eeaf98d1cbda6ac00aa031ac483451069102a277e2a7fd730b0eb

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