Malicious PDF — malware analysis report

Static analysis result for SHA-256 a912c91134473678…

MALICIOUS

PDF

84.8 KB Created: 2021-04-02 03:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 366449ab03946e7db730ca944d667fc2 SHA-1: 3a93404e4ccedbc9c9b136fcb4743d64f10d0192 SHA-256: a912c91134473678352e9584536c532e98c735988363f1e3c21e07055854eae3
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 0.9991

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://lozipotod.ru/aws?utm_term=altec+lansing+life+jacket+3+won%2527t+turn+on PDF link annotation
    • http://tipofeliluget.medianewsonline.com/51454657280.pdfIn PDF document text
    • http://tujijamutibe.sportsontheweb.net/sabalarijigar.pdfIn PDF document text
    • http://wuvilorilete.22web.org/magnavox_zv450mw8_universal_remote_code.pdfIn PDF document text
    • https://cdn.sqhk.co/lasumalena/ghaPDia/gangstar_game_for_android_free.pdfIn PDF document text
    • http://lerasusakibura.22web.org/4545063700.pdfIn PDF document text
    • https://cdn.sqhk.co/pevizopubok/iiidqFW/jobomanusexixetoranulop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wipadafefuxasi.onlinewebshop.net/wivugerusura.pdfIn PDF document text
    • http://kovawasokagi.epizy.com/6844221985.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/rusibojanevubefugelum.pdfIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_61e7fbe2565040c2b4e3198fef9d54b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/fekivupuxorutomolo.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_ed9fe5f96d8448f6835014c24029ad5d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dupula/lesurujirafenodonama.pdfIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_636c08c7ae424dad824dc14e00551344.pdf?index=trueIn PDF document text
    • http://nejukiwipe.rf.gd/setup_suddenlink_remote_control.pdfIn PDF document text
    • http://zigakakedulogim.myartsonline.com/kisitonizuwoluba.pdfIn PDF document text
    • http://pefebamiw.rf.gd/77013794716.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/analogous_color_scheme_worksheet.pdfIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_d87d85e2d4184c96b0e7c2079730ccf2.pdf?index=trueIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_0f509214a47b4a4a889a291e0a64685a.pdf?index=trueIn PDF document text
    • http://jibukut.epizy.com/52492077413.pdfIn PDF document text
    • http://limirosu.rf.gd/tozizujipo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCF 5468 bytes
SHA-256: 244afb30e54d051969130f96801525e78d06ad9e143ae50cb2621851622db535
font_01_sfnt_off0000fe97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE97 1908 bytes
SHA-256: 8ab923703a6cb8420f8fca7bd3ad5728ba4bd58dd88d5cf9a7680080d3c28edf
font_02_sfnt_off000107e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E7 11212 bytes
SHA-256: 16cb4953b4003d34b8f5b492a19ae15fb7cb2da068cc7a264d3eb482ad1d3bc9
font_03_sfnt_off00012e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E35 16060 bytes
SHA-256: d8a1a34de14a7b8fce5e51635835121d353d188f9ac9ce1e11538509fd4c5cdc