Malicious PDF — malware analysis report

Static analysis result for SHA-256 602d1a2ae4a605a5…

MALICIOUS

PDF

138.0 KB Created: 2021-05-20 23:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 43d7d603ee2560683b8404610e230086 SHA-1: d36312edc6444ad4d4773abe6070a2a162878d2c SHA-256: 602d1a2ae4a605a515723afcd7bb11ea06d880b48d690fa4f0a362071242941a
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik'. This indicates the document's primary purpose is to lure the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is sufficient evidence of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://yafferge.ru/strik?utm_term=when+did+prison+education+began In PDF document text
    • https://cdn-cms.f-static.net/uploads/4392237/normal_601f6b092c19e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502268/normal_5fdc33b09a9a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405945/normal_60291a6b86f0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483345/normal_5fff397417aeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_6064b9a3b29e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446490/normal_601f6b93b50f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366336/normal_5ff23a68468fd.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/067d7ac6-e349-4d21-938c-02ade805bb43/what_are_the_4_parts_to_darwins_theory_of_natural_selection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1917f2e-267e-4797-b93b-c15c6dd16344/tazesidux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/613f5171-f26b-4e05-8aae-5e4680248ba0/brother_lx2500_stitches.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68e14a7d-2c95-4876-a083-3cf97260d3a1/how_to_use_pro_tools_10_without_ilok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70053820-5312-46bc-8b89-673e888b5e04/69236282612.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89145534-6f0b-4f72-ab8e-9924a466b4a7/saxevinijud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fc48e8f-3d89-42db-8056-fc0601690d7b/how_to_repair_your_car_in_gta_5_cheat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f65adb36-420f-4a9b-b174-af362d1c42a2/who_plays_in_percy_jackson_sea_of_monsters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17561a67-3b17-40c1-81a0-716014eb6b1c/43054355854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59ec00bf-4662-4e69-8e63-b8bce302a2b4/how_much_does_operations_manager_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b3cbae0-9e25-43bc-bec8-04c01525823d/how_to_install_evenflo_pivot_infant_car_seat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a69adc3-843c-4806-b225-0e3d424904e2/how_to_open_a_retail_store_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9310b78b-53a5-4f56-a12d-4de21f016519/spice_and_wolf_manga_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1ba42d2-75fe-4b4e-8bab-c64adac4bbdb/12808287603.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_off0001c8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8DE 5456 bytes
SHA-256: cbe598f4d2df63429795e482c32a78711a60975ad2bb5b7e87e8db0dd9db1526
font_01_sfnt_off0001db6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB6D 12356 bytes
SHA-256: 7ea29002301ac26354aecf843ff6d6b17c04f1a0ed05a09813d20c02e8f55137
font_02_sfnt_off00020558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20558 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7