Malicious PDF — malware analysis report

Static analysis result for SHA-256 27efb68f2d61389d…

MALICIOUS

PDF

79.9 KB Created: 2021-03-30 06:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: bcf63e5c42bb84bdafb8bfee718a9c59 SHA-1: 5743d596cd283a08bfcda9290c143953e596d629 SHA-256: 27efb68f2d61389d25e5892850c41f00ece3dfc2a89309e48211462099694d50
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, appears to be a lure related to search terms, suggesting an attempt to trick users into visiting malicious sites.

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 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://golowaki.ru/award?keyword=learning+how+to+learn+oakley+pdf PDF link annotation
    • http://kevumoler.22web.org/dazisunelugasoza.pdfIn PDF document text
    • http://filanion.online/cuddeback_model_f2-c_manual14nl0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450631/normal_603f93a4c2c1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426945/normal_5ff29eeab94a3.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/legend_of_heropolis_mod_apk_latest_versionzr1sy.pdfIn PDF document text
    • http://vujadijijevi.iblogger.org/ocr_a_level_psychology_textbook.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403816/normal_5ff555402de98.pdfIn PDF document text
    • http://wolifote.getenjoyment.net/mail_merge_in_excel_to.pdfIn PDF document text
    • https://cdn.sqhk.co/wedegetuso/gk6DgdA/14736155805.pdfIn PDF document text
    • http://pekuxareja.22web.org/brche_test.pdfIn PDF document text
    • http://bukuxojunuz.mypressonline.com/equidade_e_genero.pdfIn PDF document text
    • http://talkme-news.info/allow_mock_locations_android_91yvcr.pdfIn PDF document text
    • http://requiremcgood.com/56742647888nc5b4.pdfIn PDF document text
    • https://cdn.sqhk.co/futogifoku/O6diCje/fawudipusipab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444646/normal_602612bf6a648.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/8900f7ba-cc84-4405-83a2-6bfe1b80a730/wavufogowomedata.pdfIn PDF document text
    • http://tufukeg.epizy.com/xudowefopine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/983bed76-202a-466a-8fe8-533e4c5050a2/mavudugof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a655640-ab24-4164-a295-7e2f3c186287/examples_of_cloud_computing_service_models.pdfIn PDF document text
    • http://fubegamo.epizy.com/xorepotiruwodolelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d67b6e-4a42-431f-86b7-f90404dd9b36/52984667230.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_off0000f86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86E 5324 bytes
SHA-256: 51759698472527b49e7770840d41d483ddc943339fd95bbafe496af06ac30b0e
font_01_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 11072 bytes
SHA-256: 475afbb50de29b501c909dc077bd7ab64621178baeda881b90467d6c2edffafa

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