Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c635c0de43d73f8…

MALICIOUS

PDF

78.3 KB Created: 2021-03-28 07:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8c86b43f6c8d51be93f69c7749f29611 SHA-1: dd87954fb82256fe14c993f1c9e849e14c6bcbae SHA-256: 5c635c0de43d73f8f780bf14b2534ac01a4ea3bfd90af8e454b85cb16e8079eb
192 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML_NYX_PDF_MALICIOUS classifier also flagged the file with high confidence. The document body, though heavily obfuscated, appears to be a lure related to exam dates, suggesting a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=cbse+2018+compartment+date+sheet In PDF document text
    • https://xosulokut.weebly.com/uploads/1/3/4/4/134466674/a99c782471b8bc0.pdfIn PDF document text
    • https://fegovelusilefu.weebly.com/uploads/1/3/5/3/135330230/28e0c0fbde2.pdfIn PDF document text
    • http://gaydating.world/64218438059dxg77.pdfIn PDF document text
    • http://vadosixajobirug.mygamesonline.org/zuzudutovika.pdfIn PDF document text
    • http://hookup755.fun/kujajuxafoxikmyhkz.pdfIn PDF document text
    • http://salonapp.xyz/80313741814bqmxd.pdfIn PDF document text
    • http://jiwafuwik.22web.org/1630015650.pdfIn PDF document text
    • https://voximarabot.weebly.com/uploads/1/3/1/3/131383255/9347591.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/compliance_manager_job_description.pdfIn PDF document text
    • http://penafur.scienceontheweb.net/racconti_brevi_in_italiano_per_stranieri.pdfIn PDF document text
    • https://jutawalafomas.weebly.com/uploads/1/3/4/3/134316275/25a64b.pdfIn PDF document text
    • http://save50it.info/living_religions_9th_edition_chapter_5ozwxq.pdfIn PDF document text
    • https://famonusowofem.weebly.com/uploads/1/3/4/3/134349488/lakisef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vapovefov.epizy.com/84393796385.pdfIn PDF document text
    • http://wabiwixi.epizy.com/12847553637.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/debex.pdfIn PDF document text
    • http://xofunuxemijowex.rf.gd/banking_services_chronicle_current_affairs.pdfIn PDF document text
    • http://fugegodipe.epizy.com/big_ideas_math_algebra_1_common_core.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/autograph_movie_480p.pdfIn PDF document text
    • http://xutakubu.epizy.com/how_do_i_get_my_afterglow_headset_to_work_on_my_xbox_one.pdfIn PDF document text
    • http://pekowob.onlinewebshop.net/technical_data_sheet.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_off0000f1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E7 5848 bytes
SHA-256: 60d2a0784b2572bf9510dae5c3f5f503d993eb7fbbbb309ff364a89fa76db72c
font_01_sfnt_off0001059b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059B 10644 bytes
SHA-256: 5a559eabb335c4bc34a055b8ed82c3ecd6179a2896ff082dbfcf79fb29edbf38

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