Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4b9b89dcb294c1…

MALICIOUS

PDF

96.9 KB Created: 2021-03-16 05:43:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: da532f16b7f4a9664bdd7c2fb85935bb SHA-1: 45e07b50247ecf48c2deb3bd23712032da611b8f SHA-256: aa4b9b89dcb294c100dd97d515f669e5fc62653f813c7963a7dbe4d434b0e9fb
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector and a link farm. The primary malicious URL identified is dafemum.ru, which is likely used to host or redirect to further malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=melted+and+cooling+heat+and+pressure In PDF document text
    • https://cdn.sqhk.co/salenasova/jihhFgg/nazagutenutawon.pdfIn PDF document text
    • https://cdn.sqhk.co/wusosekame/jidjj8u/seroquel_medication_information.pdfIn PDF document text
    • https://cdn.sqhk.co/rifelefiw/biaicDc/sun_mountain_micro_golf_cart_gt.pdfIn PDF document text
    • https://cdn.sqhk.co/niminililez/hfvjifq/zubarebafogizakagaxarulew.pdfIn PDF document text
    • http://znakomstva18x.site/wodijawoxodoritovoviktd61.pdfIn PDF document text
    • http://vvinorama.fun/teradata_dba_tutorialtcci9.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/jiiSTwm/download_export_contacts_for_whatsapp.pdfIn PDF document text
    • https://cdn.sqhk.co/guzorata/ic7aih4/60474761580.pdfIn PDF document text
    • https://cdn.sqhk.co/fivufotimad/iggi6jg/77054368029.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/iaJgjXI/vapefim.pdfIn PDF document text
    • http://ig-socialmedia.xyz/47189117770tfyqe.pdfIn PDF document text
    • https://cdn.sqhk.co/ramidazumiko/mlfhcgv/download_game_worms_3d_pc_full_version.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/hbvRjek/ant_radio_service_virus_free.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/f9182929-0535-4d3a-a813-4c290069e1ad/jikapomawenibo.pdfIn PDF document text
    • https://d650f791-4ca6-4964-96f1-ba9fac0414c1.filesusr.com/ugd/adf9cb_015c7f7983b34fb9977eb38062f9abc1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9f8b767-b0b0-41a8-901a-1a0b6c485c8e/volofidewepekesexubutaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bda5083a-a4a7-401e-ae8b-94b904dd7543/wurowiloluvegatakufovukig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e839a56f-2ea6-4038-8811-81e492602761/kosomepof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/337b16f2-0356-4eee-8a7f-c74e80baeb3f/lexifatuvusarexalutu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7039cc88-a899-49f8-8ea9-93e612f263c0/39587728484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f159f906-34b6-4771-a9f5-52b88e4ff8bf/hp_probook_6555b_factory_reset.pdfIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_9cd08b5d6e2f44d387476cef3a90ff49.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba5f9061-8b2c-49bb-9fc1-4780c6695e33/nurorij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9943dc05-bba6-4157-bd86-57420afcd9e9/shortcut_to_update_table_of_contents_in_word.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA8 5340 bytes
SHA-256: 37e7e58ec90477412d5455dd101a3f51a6fd8ffe5e2102cb82a15d4b787b6df9
font_01_sfnt_off000141cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CC 2028 bytes
SHA-256: 8a886e4c811b781a6b717ced0b775151b174bc657aab0307b1ce94e3b2523456
font_02_sfnt_off00014b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B6B 12292 bytes
SHA-256: 59cdd592f8fa024734510c02a2e284b8b501a920369ce2a39f66596d57fc057c