Malicious PDF — malware analysis report

Static analysis result for SHA-256 244295c3606189bf…

MALICIOUS

PDF

72.2 KB Created: 2021-03-11 08:18:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: a76c20529f898b663f77feff8e9f178c SHA-1: bb9f15892b221c67a552791f702aae5b4aad7626 SHA-256: 244295c3606189bf88e8b9efb1554f57d230766a3914aec7359ba95e97ddcaa2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards exploitation of PDF vulnerabilities or social engineering to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://xajibur.ru/wix?keyword=boston+city+directory+1910 PDF link annotation
    • http://acupofjacob.com/carbonyl_reactioncpmq0.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/apush_amsco_book_2015.pdfIn PDF document text
    • https://zeruxitewisav.weebly.com/uploads/1/3/1/8/131856065/kogugenuxof_korewadoxawisaj_gubojojokom_mazewuwubozak.pdfIn PDF document text
    • https://lirukasuk.weebly.com/uploads/1/3/0/7/130739032/joxireluk.pdfIn PDF document text
    • http://zisezamerares.mygamesonline.org/tifozojutugojomimirisawul.pdfIn PDF document text
    • http://redirerer.medianewsonline.com/fundamental_astronomy_download.pdfIn PDF document text
    • https://mewupevubuk.weebly.com/uploads/1/3/5/3/135387541/lopadolonuwovamedej.pdfIn PDF document text
    • http://riragukigud.scienceontheweb.net/6106398182.pdfIn PDF document text
    • http://shop-profildoors.ru/carnatic_music_lessons_book6ojjy.pdfIn PDF document text
    • http://afracheat9.xyz/dragon_ball_xenoverse_2_game_guidemxxuo.pdfIn PDF document text
    • https://mamonaxerif.weebly.com/uploads/1/3/5/3/135347384/godixomipupe_nulojekolexoze_wezakap.pdfIn PDF document text
    • http://lijobisegozij.iblogger.org/zoruvitavosugek.pdfIn PDF document text
    • https://fumevixupi.weebly.com/uploads/1/3/0/7/130775707/togesididaliz.pdfIn PDF document text
    • http://bigojojodun.iblogger.org/what_do_i_need_for_my_permit_ny.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/sedowedi/bandook_chalegi_video_hdvd_9.pdfIn PDF document text
    • http://mugavividuroka.rf.gd/49011034530.pdfIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_aa617202480c403f95fbaf29fbc15c20.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/aashiqui_2_movie_images.pdfIn PDF document text
    • http://misovin.epizy.com/zorumarize.pdfIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_352f3e8f72804c6a8fd115e1b59c02d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/empty_character_sheet.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/what_does_bq_mean_in_business.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_off0000df9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9A 5192 bytes
SHA-256: 39b9c7299e98b8c218a303bc1e5b59971f109e26deb08b9dd329d0a9f7b7586b
font_01_sfnt_off0000f168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 10032 bytes
SHA-256: 6899ee833352f4478cd7f30553ccdd3821d7945b44ff5df9bab1abd1b51f0961