Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7d6ddb0c010349…

MALICIOUS

PDF

73.7 KB Created: 2021-03-15 08:42:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f29fa0273f8d381365fed280564972d6 SHA-1: 2555645250298b715630ec168f2870376ee40ad3 SHA-256: fb7d6ddb0c0103499aa083ba658efb234987711dde06d3e6e715602ddcc86584
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning or redirecting users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' and the presence of multiple external URLs, including one pointing to 'vilenefex.ru', strongly suggest a malicious intent to distribute or redirect. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/wix?keyword=mayamatam+english+pdf+free+download
    • https://zeburunonuf.weebly.com/uploads/1/3/4/4/134458398/1750425971b0f9.pdf
    • https://fekobuwag.weebly.com/uploads/1/3/1/8/131858403/rodum.pdf
    • https://posuzelivoj.weebly.com/uploads/1/3/4/8/134869480/7885917.pdf
    • https://sajolunuweto.weebly.com/uploads/1/3/1/4/131407571/fc6c1c9535a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vininotubosom.epizy.com/88317841547.pdf
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_cb381b899b6b48888fe94e49047854b1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7d1d8071-fa85-4d06-82c1-f906c75f5183/how_do_i_connect_my_canon_mg3620_printer_to_wifi.pdf
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_d3c3c6f449884ca7bb681ccd06d01f4b.pdf?index=true
    • https://s3.amazonaws.com/gizonukorad/bofozipaweselawasesotam.pdf
    • https://s3.amazonaws.com/nigimul/definition_of_congruent_triangles_worksheet.pdf
    • http://lemujiv.epizy.com/lanovupetuju.pdf
    • https://uploads.strikinglycdn.com/files/7da7a6bb-46af-42b2-b0eb-11fea999b73d/carry_on_suitcase_size_for_airlines.pdf
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_7fbd3b4185f1406a9698232806d4cbd9.pdf?index=true
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_069b6de472b845b5b9df02a1ff45df97.pdf?index=true
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_ce573afc72024e738f3780da38593d6a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8f1c6091-6c0d-4ccd-8a51-9f3fc7ab6696/how_to_check_word_count_on_powerpoint_2007.pdf
    • https://uploads.strikinglycdn.com/files/c0b264a4-08dd-4cab-8695-667be7ad1e10/aprender_ingles_escuchando_audios.pdf
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_1d81ac1934ee4a478f9f4528a38844d3.pdf?index=true
    • http://nipipaxala.rf.gd/practical_meteorology.pdf
    • https://s3.amazonaws.com/titugome/hair_cutting_style_photo_boy.pdf
    • https://uploads.strikinglycdn.com/files/a686fa72-1bb8-4573-94ef-a013f59e6d06/craftsman_29cc_edger_blade_replacement.pdf
    • https://s3.amazonaws.com/xijalovelokolep/83987186478.pdf
    • http://janedap.rf.gd/xenyx_802_mixer_manual.pdf
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_fa8ad849dd954240b0a2cc51f63716d3.pdf?index=true
    • https://ec75ba9f-29a7-4b73-bb51-4c951d20089f.filesusr.com/ugd/17cde0_83a9eea9442e44428c64f1c948bf3691.pdf?index=true
    • https://s3.amazonaws.com/kufazete/bike_race_movie.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb0.bin
834645592617e6bfbafe731dc980589ed577fca7abc38a1b47f3e57a923402ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 5656 bytes
font_01_sfnt_off0000f2ed.bin
dae754667c0040d3c1403a9e193d60b68adb083d9ad54a3aa5958ff05b2fb861		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 12072 bytes

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