Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6fd9bfa003a2ee3…

MALICIOUS

PDF

82.5 KB Created: 2021-04-08 00:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 16a96bb7d4cad6288d637b7c9e801916 SHA-1: 51198e35f082fadeef6d06c99bd023c03e211f90 SHA-256: c6fd9bfa003a2ee33b3a47e61be56a25cab2f79d7f3ef7d79fc4a4a4ffea6258
166 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some of which are hosted on disposable domains. The document body, though heavily obfuscated, suggests a lure related to a 'Whispure 510 manual', likely a pretext for phishing or malware delivery. The presence of security bypass instructions further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://xezojetit.ru/wix?keyword=whispure+510+manual PDF link annotation
    • http://mandarins.space/17052051247mq765.pdfIn PDF document text
    • http://clubstore.pro/907591460812xe8b.pdfIn PDF document text
    • http://ooovseanalizi.ru/how_do_atoms_combine_to_form_molecules_and_compounds0b8fu.pdfIn PDF document text
    • http://julozagoren.22web.org/dizimabozevovuxof.pdfIn PDF document text
    • http://joxutikomujawi.iblogger.org/centre_songhai.pdfIn PDF document text
    • http://vobonenagixavus.66ghz.com/witijopidemavowu.pdfIn PDF document text
    • http://goodik.fun/8579304737405kll.pdfIn PDF document text
    • http://lollipopa.online/42448599898d2hff.pdfIn PDF document text
    • http://xiwikene.iblogger.org/carol_of_the_bells_choir_noten.pdfIn PDF document text
    • https://opgamers.net/coc/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://57e596f1-a2cf-4e3c-9ba9-dc8e42e7d639.filesusr.com/ugd/1e1da7_1c6abcc5e6694f75a2eb69e0ce7409b1.pdf?index=trueIn PDF document text
    • http://zasugizej.epizy.com/40235867877.pdfIn PDF document text
    • http://bepunemafozo.epizy.com/94347188209.pdfIn PDF document text
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_d94594728c0d4004b2f91244cf84219d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/56eda98a-0ffa-47a9-b40f-67b3f8948007/how_to_get_a_free_robot_vacuum.pdfIn PDF document text
    • http://gulalebiton.epizy.com/20848476012.pdfIn PDF document text
    • http://ruditofejew.rf.gd/najomajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/754ba7e0-7985-443b-881f-f6abe0fc86f0/fivabogilosejovebibotike.pdfIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_1e5a5c7f114e4d5298e80248ac6dcbdc.pdf?index=trueIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_717b54e6379d494987901f494a69c691.pdf?index=trueIn PDF document text
    • http://xidozex.epizy.com/gomubenukobipudojojebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89f3b4f9-7f08-42ff-b635-d0fa25104e89/multiple_project_tracking_template_excel_xls.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_off000104f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 5392 bytes
SHA-256: c92c0783303a589c5fc76f7f02c2d21ec3aed30b644e9cbf260f8a13e7d7de7c
font_01_sfnt_off00011734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11734 11116 bytes
SHA-256: e121dbc85cfb2b604cd6055e48b50bcc1af7ec2a3a6294a5a16342f4b58623d0

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