Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31e9b4db81a39b5…

MALICIOUS

PDF

77.9 KB Created: 2021-03-28 08:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7c0be2d33f5123af7be6304d080d70f7 SHA-1: 83bb0397b0059db6fd3182825220c4248f5a6f50 SHA-256: a31e9b4db81a39b509229dea05220b2039adb76c9a15190760395f122672bd63
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://fokemale.ru/123?utm_term=airserver+embedded+linux PDF link annotation
    • http://sewawena.scienceontheweb.net/barriers_of_communication_in_an_organization.pdfIn PDF document text
    • http://pifowovumuwe.medianewsonline.com/tofedusejirodapere.pdfIn PDF document text
    • http://sberbank.services/action_movies_free_sitesb6pl6.pdfIn PDF document text
    • http://fozivot.mypressonline.com/gepibugo.pdfIn PDF document text
    • http://navalny.design/7-2_practice_similar_polygons_form_g_worksheet_answersp6sgf.pdfIn PDF document text
    • http://trudogoliya.online/color_notes_for_windowste0yz.pdfIn PDF document text
    • http://7gusevshop.space/wendys_pub_fries_nutrition_factsniktr.pdfIn PDF document text
    • http://studyweb.site/honda_power_equipment_eu2000i_inverter_generator_reviews3xi6e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://timivaferegigor.rf.gd/bartok_mikrokosmos_2.pdfIn PDF document text
    • http://xakosafejel.epizy.com/filematixudun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78da10c8-7437-4d56-b5f4-b27bedd85a94/rotojepuzazezagitaxikuwab.pdfIn PDF document text
    • http://jasulogitese.rf.gd/54993108106.pdfIn PDF document text
    • http://tufewoxawaw.epizy.com/how_much_is_a_used_gtx_970_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc461ff3-cf04-483d-8bd5-d11df4717145/72336942081.pdfIn PDF document text
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_e788a08b702e4818930b2d2c63c5ff7b.pdf?index=trueIn PDF document text
    • http://lopoxupalajimuv.rf.gd/70895925061.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/89528508044.pdfIn PDF document text
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_6e614664def74694ab2aeb142d6e6737.pdf?index=trueIn PDF document text
    • https://53ee2ee6-42da-4c96-954f-60f726bc8d53.filesusr.com/ugd/de2744_2064d80776634a82b01459cc3fa2707d.pdf?index=trueIn PDF document text
    • http://jifisuxevizek.myartsonline.com/saduvonubomejofozanejizo.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_off0000dca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA1 5020 bytes
SHA-256: 7a2e8646176612489acac98fa7451062046693858fe9e0a56d4588e98ca58bab
font_01_sfnt_off0000eda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 11060 bytes
SHA-256: f2e3a039861428c3b29e0cd8bdb2293a3b6af7dcf252fb8be1d5b77402513340
font_02_sfnt_off000113a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A6 16148 bytes
SHA-256: 3fe40d35e17ab1ce57c3898b8081a6c8e4bc1f65f9c98f6f54b9b6762c7d16b9