Malicious PDF — malware analysis report

Static analysis result for SHA-256 280d74b38e2df7df…

MALICIOUS

PDF

123.1 KB Created: 2021-05-10 07:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 524db223bb0eabcbc16f152aaa54f16a SHA-1: 2604a5cae67320185e2fac9b534c02932b25d8dc SHA-256: 280d74b38e2df7df96de12005751d5ff1550293d4030b11b66a4f43ed1c4ea1a
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards the exploitation of PDF vulnerabilities or the use of embedded JavaScript to facilitate these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://maypoin.ru/strik?utm_term=fundamental+data+analysis+and+visualization+tools+in+python PDF link annotation
    • http://bapupozizevose.22web.org/interview_questions_to_ask_construction_project_managers.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/e4hXTgi/zuxasasurokujur.pdfIn PDF document text
    • https://gajatizu.weebly.com/uploads/1/3/5/3/135315297/vuxaba-depefusakowoli.pdfIn PDF document text
    • http://jewivodapujoje.iblogger.org/velujakiv.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/hfjeou5/rpg_sound_effects_online_buttons.pdfIn PDF document text
    • https://tunuwowidu.weebly.com/uploads/1/3/4/6/134606858/polup.pdfIn PDF document text
    • https://xekijepomi.weebly.com/uploads/1/3/4/5/134508866/9617055.pdfIn PDF document text
    • https://walisisatar.weebly.com/uploads/1/3/4/5/134576301/vadukumoluni-logewibaxe.pdfIn PDF document text
    • https://siwepuxerit.weebly.com/uploads/1/3/0/7/130775843/weboxex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d6bd03e-b40a-41f3-b3a2-ec9183e4d1f9/what_is_the_best_atf_4_transmission_fluid.pdfIn PDF document text
    • https://3e021c9a-284a-4c54-9ba1-f6d43d4d2ba5.filesusr.com/ugd/a619af_90e4164603f547cfa487210487af34f4.pdf?index=trueIn PDF document text
    • http://towaduzabuxake.rf.gd/professional_apache_tomcat_6_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fe88e4d-f6e8-43ae-ac83-ac4700aa524a/93154220453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0b1af0b-4041-41bc-b86a-62970f1dabd8/what_is_an_unsigned_supreme_court_opinion.pdfIn PDF document text
    • http://fewasav.rf.gd/predator_2000_watt_super_quiet_inverter_generator_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94a01a95-c06b-42d1-9ff9-36b4a38e2473/pozoxezobopuvokuxopazud.pdfIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_dbf0a03dd67f4d64ac70ea4b86986218.pdf?index=trueIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_5b62573ccb254cce92337fc2c1fb6822.pdf?index=trueIn PDF document text
    • http://melaworogafema.epizy.com/battery_overlay_percent_premium_apk.pdfIn PDF document text
    • http://vufilupirudote.rf.gd/36304058272.pdfIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_92164859614f463e95e6330310c3954a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/80f21773-2d42-44ee-a2e9-a788e4e4bffb/verizon_lg_flip_phone_battery_replacement.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C4F 5272 bytes
SHA-256: e2b1888b47707459d848739b9f5014bea55cd4430a54b38455f0a69fcef4a9f4
font_01_sfnt_off00019e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E2F 12096 bytes
SHA-256: fa551dc88e914344424229e36e8af30652ccd47a70ac00931e8ef368ebe8ea28
font_02_sfnt_off0001c74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C74A 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953