Malicious PDF — malware analysis report

Static analysis result for SHA-256 61716c7c240d93d5…

MALICIOUS

PDF

71.7 KB Created: 2021-06-12 06:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d8fae218ed261ea20d1398b1a618236 SHA-1: ce71d8f819a0909823cb583b9409af86edc8d522 SHA-256: 61716c7c240d93d5006cbfc74c3eb2f3d9a406b4731e16b286340bdbd8aed061
136 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL that appears to be a lure for downloading software. The presence of 'cmd_windows_10.pdf' and other URLs suggests an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://wastran.ru/pbw?utm_term=download+ppsspp+gold+for+pc+free
    • https://static.s123-cdn-static-d.com/uploads/4499995/normal_60b7564495507.pdf
    • https://cdn-cms.f-static.net/uploads/4444353/normal_602760fb6fa69.pdf
    • https://cdn-cms.f-static.net/uploads/4380379/normal_5fdc4bc5ea2bd.pdf
    • https://cdn-cms.f-static.net/uploads/4421473/normal_603e4fa55d884.pdf
    • https://cdn-cms.f-static.net/uploads/4495838/normal_602aff1302e45.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f07f4d13-64ca-41c7-bd71-be0f5965babf/how_much_do_david_and_annie_make_on_90_day_fiance.pdf
    • https://uploads.strikinglycdn.com/files/a2046db0-004d-44a1-88ea-f89bf3609283/importance_of_report_writing_in_an_organisation.pdf
    • https://uploads.strikinglycdn.com/files/b63483ad-adb4-4e12-89f1-03aaf51f0612/86604651261.pdf
    • https://uploads.strikinglycdn.com/files/86e50949-dc5a-450d-a924-22c1b597545e/paintball_supply_shop_near_me.pdf
    • https://uploads.strikinglycdn.com/files/ec9559ac-46f5-4f63-a9be-8fa2e2e6a4fd/how_to_get_serial_number_using_cmd_windows_10.pdf
    • https://uploads.strikinglycdn.com/files/edeccd07-fbf7-49a8-9f75-5a42f77ced83/56321826403.pdf
    • https://uploads.strikinglycdn.com/files/e58e868d-0db7-4b0e-abb6-c6e9356f382c/is_100_wpm_fast.pdf
    • https://uploads.strikinglycdn.com/files/36c1c3b4-2d4a-40c5-be90-a83ee90a8c21/free_printable_map_of_uk_towns_and_cities.pdf
    • http://voveras.pbworks.com/w/file/fetch/145117749/ninja_gaiden_dragon_sword_rom.pdf
    • http://luwosotatex.pbworks.com/w/file/fetch/144730122/harry_potter_and_the_prisoner_of_azkaban_pc_game_castle_secrets.pdf
    • http://binovilijire.pbworks.com/f/venum.pdf
    • https://uploads.strikinglycdn.com/files/dd52c26d-8428-4444-b1da-0eb7f82ad6f8/free_printable_colored_fraction_strips.pdf
    • http://sufizilofab.pbworks.com/f/4.pdf
    • http://subuzuj.pbworks.com/f/17711488607.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/
    • https://uploads.strikinglycdn.com/files/e
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d940.bin
97e60fe18a3b7a0995339d629e600b5437a3f9799b1f0268a1de110495b90168		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD940 5416 bytes
font_01_sfnt_off0000ebd9.bin
f6f43a2d00ec3c91ad0de9941cd48ba5729cdba38f6eca8a2b874668c6627f9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 11132 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.