Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca254d79ce689b9a…

MALICIOUS

PDF

81.2 KB Created: 2021-06-07 08:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 75f25fd0d7a63b3f45195b96b25b0878 SHA-1: 4361b16e479e87dcf86b5a86a6998232b695ee0d SHA-256: ca254d79ce689b9a170ff0936db0aabc9cee9681c6ed07e087eb2af83e868f51
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link farm with multiple external URLs, including one that appears to be a lure for downloading Windows 10. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests a phishing attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://synerhu.ru/pbw?utm_term=win+10+1909+iso+file+download PDF link annotation
    • https://malodarugamizo.weebly.com/uploads/1/3/4/8/134853004/15cff3.pdfIn PDF document text
    • https://bupigesow.weebly.com/uploads/1/3/4/3/134360728/27557.pdfIn PDF document text
    • https://govenovu.weebly.com/uploads/1/3/4/7/134701044/pexudipabetewesiwuvo.pdfIn PDF document text
    • https://bemafaparad.weebly.com/uploads/1/3/2/6/132681832/d821642.pdfIn PDF document text
    • https://tawojupaker.weebly.com/uploads/1/3/4/8/134885799/fopunirov-lisibeguzel.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/1503d9b1-0911-4783-a1c3-e3d1f8f640c4/what_gang_wears_red.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06b245a5-2371-45a7-9444-5cf8ec19f097/the_particular_role_an_organism_has_in_an_ecosystem.pdfIn PDF document text
    • http://gudotoxej.pbworks.com/w/file/fetch/144496896/wesoxavowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c399b8ca-beed-46f9-ab19-c905a77ed194/22069000497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69fe4799-678e-4b1a-9e77-55a4ad7e51f7/kohls_30_promo_code_nov_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b84f1d2a-7c8a-441a-b5ff-0959c1f9e668/graco_snugride_snuglock_30_infant_car_seat_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f0e1360-d36f-4065-929a-302649bfc20e/abituriyent_jurnali_2021_yukle.pdfIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144414627/78988878861.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35562897-0a19-44ad-9091-7bb208d0da6a/wireless_communication_technology_cellular.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/000db643-a042-41a7-ae48-dab3932602fa/82450321025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/334d4d9c-0e42-4331-938b-34b421a8f581/69572684089.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98af9177-fd9e-47ad-b551-dbd9ab856b95/local_area_network_lan_settings_windows_10.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_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 5260 bytes
SHA-256: a4dfc1c83357e49a8b7e6fe96a39668de76304d3c62558786faa051d9049d622
font_01_sfnt_off000105c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C9 21472 bytes
SHA-256: 5664e104d9dbe36e51020043a6685bf4c45dac97159298bc066a6be144d6a3d8

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