Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6bec37d88b1afa…

MALICIOUS

PDF

87.1 KB Created: 2021-03-31 04:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2697952e50022a14a7f41646a18d101d SHA-1: 5546de999eddd0e8eb20b69e10e4880428d1058f SHA-256: bd6bec37d88b1afa211a86918f33046bb2073533196c652e4eed3c694d180f2e
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=best+productivity+apps+for+android+tablet In PDF document text
    • http://kifejuja.medianewsonline.com/introductory_econometrics_a_modern_approach_7th_edition_solution_manual.pdfIn PDF document text
    • http://fibisazorowax.mypressonline.com/knowing_god_as_father.pdfIn PDF document text
    • http://segaruzobuguses.scienceontheweb.net/38893781228.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/viwixojuvoz.pdfIn PDF document text
    • http://didazema.mypressonline.com/jovowevebumifiwuduvi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_ee4b0c15db9b4fe49543f8f5be526dd6.pdf?index=trueIn PDF document text
    • http://ligoroxenafof.atwebpages.com/what_does_the_expression_tee_off_mean.pdfIn PDF document text
    • http://duxegejuw.atwebpages.com/seiko_solar_chronograph_v172_review.pdfIn PDF document text
    • http://xufizup.rf.gd/lunelegetefikulufutexafe.pdfIn PDF document text
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_f269fcc67e5d48a38230073a7545a858.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/motujubukazagutom.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/61545791625.pdfIn PDF document text
    • http://nuluwajewugutik.onlinewebshop.net/wowobopaxon.pdfIn PDF document text
    • https://901b9152-9067-49c5-8541-bb90c1a77dfa.filesusr.com/ugd/5d84e8_b57895b291634531af80292b390f984b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/lesusubosalu.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/academic_writing_for_graduate_students_commentary.pdfIn PDF document text
    • http://makekafes.epizy.com/waec_chief_examiners_report_2017_nigeria.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/french_alphabet_pronunciation_guide.pdfIn PDF document text
    • http://gozidonozali.myartsonline.com/84567825388.pdfIn PDF document text
    • http://sebokegekesuded.atwebpages.com/budobejutapedafupedi.pdfIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_565bbe1de6e645d2847b223fd4f6f30a.pdf?index=trueIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_7a53e3c30cbc43dd873a03d57ccdfcd4.pdf?index=trueIn PDF document text
    • http://kitijowu.rf.gd/metodos_anticonceptivos_msp.pdfIn PDF document text
    • http://guxajofiv.epizy.com/mafenexil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10956 5384 bytes
SHA-256: 616295c8017b394d8f16c7d1f6150649fa08ccfae1b743a62eee2ebdf5d73acc
font_01_sfnt_off00011bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC0 10720 bytes
SHA-256: d6f8bf0ae5e0682ecd89fdf042544e18d6e72da0760a967fee1f43b48cfba665
font_02_sfnt_off00014054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14054 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e