Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd0dcf2bcd1a701…

MALICIOUS

PDF

77.7 KB Created: 2021-03-30 19:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 95bd3d10b4fd1095d1d0e889d35aee68 SHA-1: 280ef235c406dbfc909bdc3bebbc8107c06451be SHA-256: 3cd0dcf2bcd1a7015a184a6df9460e6b7fdabc59b8d726a7c1aee46d414b1007
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing operation. The embedded URL `https://fokemale.ru/strik?utm_term=cen-tech+60794+firmware` is particularly suspicious and likely serves as a lure for users seeking firmware updates.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://fokemale.ru/strik?utm_term=cen-tech+60794+firmware PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4502439/normal_60262362bcaed.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/iR2Uibl/ps4_remote_play_not_working_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/buzovegom/jibghhf/736047299.pdfIn PDF document text
    • https://tulivugid.weebly.com/uploads/1/3/4/6/134607321/tajerasurazolunut.pdfIn PDF document text
    • https://pobivizitonep.weebly.com/uploads/1/3/2/8/132815986/7802271.pdfIn PDF document text
    • https://cdn.sqhk.co/vukupamita/xjgetQT/lomajazurizekagigi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476783/normal_6003a21161687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385207/normal_60172e5be6589.pdfIn PDF document text
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/3b9ffba297.pdfIn PDF document text
    • https://jekufagiz.weebly.com/uploads/1/3/0/7/130739150/nalum_bidazi.pdfIn PDF document text
    • https://cdn.sqhk.co/zivugeri/oAY66is/fungsi_manajemen_actuating.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424630/normal_605279efb01e8.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/resisuna/63555920399.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/explosion_sound_file.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/61325855761.pdfIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_e34dd3d16d8f4c6698b2d030237bbeba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/telasebisu/vazirefolixijugevukosov.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/types_of_mac_operating_systems.pdfIn PDF document text
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_00c6dad3c6af41b2a2dbc8bf8322b1f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/regovadeje/69128736518.pdfIn PDF document text
    • https://bd5e8a39-7345-4d1c-b933-e8ec171ec4b0.filesusr.com/ugd/2dab9e_752d8af4618c45b89f707945aabb4564.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/coral_reefs_ielts_reading_answers.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_off0000ef3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 5560 bytes
SHA-256: 7d98bbb2c495927d7f43f92c9f07c35e95aec573cf6e619161971d072cec66ea
font_01_sfnt_off00010223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10223 11368 bytes
SHA-256: 28ea510e24af21e0742a5c5f38228f6bacf98997b2f0451be2d31fb2345cfa94

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