Malicious PDF — malware analysis report

Static analysis result for SHA-256 300cd9b3f033ad74…

MALICIOUS

PDF

83.6 KB Created: 2021-03-14 16:49:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 491f674456f236f435826277eb701447 SHA-1: e8113537d276b197b3db4b908a4ccc50cbf908ae SHA-256: 300cd9b3f033ad7466627c2bcccc0abdde26ea2082eaa127017cf8a8c23ef6c2
156 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. The PDF contains a large number of external links, with one suspicious URL pointing to vilenefex.ru. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, suggesting a link farm or redirection attempt. While no scripts were explicitly extracted, the nature of the PDF and the presence of external links suggest it may be used to deliver malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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/123?utm_term=kundalini+reiki+manual+pdf
    • https://cdn.sqhk.co/lepowabog/2gc5sa8/weather_radar_live_streaming_pakistan.pdf
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/9203002.pdf
    • https://cdn.sqhk.co/papowepu/gcEiauS/87299139091.pdf
    • https://static.s123-cdn-static.com/uploads/4382429/normal_5ffd5a2e9ebb8.pdf
    • https://cdn-cms.f-static.net/uploads/4378613/normal_5fe8ee4ce409f.pdf
    • https://tomavibevojivow.weebly.com/uploads/1/3/4/0/134016690/4e43d23.pdf
    • https://nunezujotegu.weebly.com/uploads/1/3/4/3/134312528/2432229ebf72.pdf
    • https://cdn.sqhk.co/kejopala/5HA5QIR/81169385063.pdf
    • https://cdn-cms.f-static.net/uploads/4505687/normal_5fe7835860c3a.pdf
    • https://static.s123-cdn-static.com/uploads/4409096/normal_600195bc45820.pdf
    • https://cdn.sqhk.co/kidurukazag/jegijfD/download_game_helix_crush_apkpure.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/27ae460d-2789-4e25-bf7c-ceee127e0164/citizen_eco_drive_gn-4w-s_manual.pdf
    • https://uploads.strikinglycdn.com/files/7bf34b72-716d-4a9b-980d-fb87b09c38e2/85606578789.pdf
    • https://uploads.strikinglycdn.com/files/06eda9db-1011-45f9-b9b4-dbbc82804e79/28200725136.pdf
    • https://uploads.strikinglycdn.com/files/3526a6ff-6e83-4eec-ad68-423bd6c0b872/nikon_prostaff_3-9x40_black_matte_riflescope_bdc.pdf
    • https://uploads.strikinglycdn.com/files/e6b3053f-8051-46ca-aac3-ad885fdec6d9/bisifisidiwenuxajonudu.pdf
    • https://uploads.strikinglycdn.com/files/a8dd3f75-2ca2-4003-83fe-a2f094e147ba/47110865884.pdf
    • https://uploads.strikinglycdn.com/files/98762cd8-c1f9-44dd-8965-04681c782e3a/topics_in_algebraic_combinatorics.pdf
    • https://uploads.strikinglycdn.com/files/3cac4341-8b57-4c94-82f9-8cd38b80b76e/the_twilight_saga_eclipse_full_movie_sub_indonesia.pdf
    • https://uploads.strikinglycdn.com/files/2c264bad-7b7a-41bc-b999-dd1cc6d13b25/point_guard_dribbling_workout.pdf
    • https://uploads.strikinglycdn.com/files/989968c3-2133-49ed-b7a9-ebd0cf40583b/5176744601.pdf
    • https://uploads.strikinglycdn.com/files/0915f76e-bb39-465b-97fe-421423f27d77/last_of_the_mohicans_theme_song_youtube.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_off00010c86.bin
c44588dbf01312cf4fe7701b27e1a06e56615d2f922168df6af6a7f1c8958a6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C86 5044 bytes
font_01_sfnt_off00011d98.bin
b3f4492b598081828db2f24b5c352cb52c1c6f6b45b5fba52b701ab7d0c90384		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D98 10532 bytes

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