Malicious PDF — malware analysis report

Static analysis result for SHA-256 b391d80d6b85cdf5…

MALICIOUS

PDF

73.9 KB Created: 2021-03-01 23:02:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 11b481c0593a2a1c8493822dae8d481e SHA-1: 6d8e872d4d0d136a627b00607f8b46e0ceba3c27 SHA-256: b391d80d6b85cdf51861d764edc38afb039caee9580ae7b0ab06d96dc76c1f50
166 Risk Score

Malware Insights

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

The sample 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, with a primary URL pointing to 'seumenha.ru'. The presence of a 'password-protected archive lure' heuristic suggests the PDF may be a precursor to delivering a password-protected malicious archive. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://seumenha.ru/strik?utm_term=black+and+gold+hacker+mask%25EF%25BF%25BC PDF link annotation
    • https://ruminugovukaka.weebly.com/uploads/1/3/0/7/130740017/8724946.pdfIn PDF document text
    • http://tijudiwulewanuw.getenjoyment.net/burger_king_allergy_menu_nz.pdfIn PDF document text
    • https://puxezemugip.weebly.com/uploads/1/3/4/3/134311794/8c8b7c.pdfIn PDF document text
    • https://pigunakates.weebly.com/uploads/1/3/4/6/134628742/janigo.pdfIn PDF document text
    • http://reduslim-europa.site/car_crash_maximum_destruction_mod_apkwmf4w.pdfIn PDF document text
    • https://jubolovewo.weebly.com/uploads/1/3/1/4/131453214/7e2b9be92.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/population_of_every_living_thing_on_earth.pdfIn PDF document text
    • http://vumogegotawugub.mypressonline.com/9520956938.pdfIn PDF document text
    • http://duplicwcnj.space/poxesivekinmstv.pdfIn PDF document text
    • https://sudesiresa.weebly.com/uploads/1/3/4/8/134881981/kesipulowir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wunojipu/how_many_different_atoms_are_there_in_a_compound_brainly.pdfIn PDF document text
    • http://vorisenunajix.myartsonline.com/34947425974.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/lixiledavelul.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/movebipepujedavamuzudi.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/which_statement_describes_alexander_the_great_military_achievements.pdfIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/vesoguvakivu.pdfIn PDF document text
    • http://rukosivujuxu.atwebpages.com/hp_laserjet_1320_driver_for_windows_10_64_bit_filehippo.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_off0000e267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE267 5472 bytes
SHA-256: b1662090d4059ae63849b6f24c0dcbe84fc9ce7f919a7f11db08c431d1c4aba0
font_01_sfnt_off0000f4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DA 10500 bytes
SHA-256: 336144d2676b38eea73a772f0281eadf8bb52b8a13629c6e6d35b3b4a24a56b1

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