Malicious PDF — malware analysis report

Static analysis result for SHA-256 28729051f854e1ed…

MALICIOUS

PDF

97.0 KB Created: 2021-05-08 23:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d871662c8405839ba6d123aa5ec4b55a SHA-1: 257c96cb834ee2db28895591bf448fa540036d0b SHA-256: 28729051f854e1edf91536044fcb8d15024d32069ef3e86bbe5910a87446c511
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 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.
  • 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://seumenha.ru/strik?utm_term=what+is+seasonally+adjusted+cooling+capacity PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366365/normal_6057137b8b088.pdfIn PDF document text
    • http://dumazuzutone.22web.org/zigavokegawabev.pdfIn PDF document text
    • https://jovonawokemurif.weebly.com/uploads/1/3/4/6/134678447/xeniniwitukafu-puredezabi-zudevibiwedoril.pdfIn PDF document text
    • https://jareruko.weebly.com/uploads/1/3/4/3/134348829/dabebirexobi-mesudalofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454813/normal_600e940e55fbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406776/normal_606c4131f371f.pdfIn PDF document text
    • https://zadopelujon.weebly.com/uploads/1/3/4/8/134884154/3818659.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468536/normal_5fd9f577cb5df.pdfIn PDF document text
    • https://siwuluwavati.weebly.com/uploads/1/3/4/7/134756127/a8ea7.pdfIn PDF document text
    • https://sulogifobib.weebly.com/uploads/1/3/5/3/135322722/vazabajutigilitijaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://begupegag.epizy.com/categories_of_system_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0a18820-33ae-484d-81e3-67b85cc29f12/88473602606.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/piguzenopelinupilajurijax.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/51794525137.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/towifusunamifudos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33898b1d-9a86-47d4-9a28-cb26b1e88934/how_to_calculate_mixing_ratio_of_paint.pdfIn PDF document text
    • http://jotigosi.epizy.com/who_invented_light_bulb_and_in_which_year.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/616687f4-4301-435e-acc9-cba27f6be2ed/70445302079.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/platformio_error_please_specify_upload_port.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/48846919443.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/graco_snugride_30_infant_car_seat_installation.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/dolisizurigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52cf5b82-fb8f-4c43-a9f0-1db7d35ebb72/vsphere_client_ssh_port_forwarding.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/chrome_free_for_windows.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12842 5432 bytes
SHA-256: f0c0351944bc56f97ae665dc039784a20fbf658b87c7dcffe7190e00507300de
font_01_sfnt_off00013ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD9 10680 bytes
SHA-256: 049f2127f57af423361412a53c43abf43d31df3e2c2dbe4f9c97edd5f116ab40
font_02_sfnt_off00015f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F08 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449