Malicious PDF — malware analysis report

Static analysis result for SHA-256 c02d549071cd521f…

MALICIOUS

PDF

95.9 KB Created: 2021-03-20 09:28:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f95859a42f31018b670c8e240b5deaba SHA-1: dfabb52f82736ca741f034a2ec27fd89ec0cabd9 SHA-256: c02d549071cd521f870fe9cf4ec13a0c79dfd0f93a4b6ff6e7b55c02b401bd2d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were extracted, the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/award?keyword=nutrition+books+for+bodybuilding+pdf PDF link annotation
    • http://changely.club/fossil_q_explorist_gen_4_specificationsn6h7t.pdfIn PDF document text
    • http://strongcreditscore.info/words_to_stressed_out_by_twenty_one_pilotsdbyuz.pdfIn PDF document text
    • http://idem-peshkom.ru/pator07vh5.pdfIn PDF document text
    • http://mavitrade.com/the_hunting_party_movie_2007cjtyk.pdfIn PDF document text
    • http://kukushka.space/laxivivokesavomoretivuje7yi1y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_53a2c62b1fa14e859a8a9cd942aeed3d.pdf?index=trueIn PDF document text
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_36a6411404224b4caf9600cf8d5e5ef7.pdf?index=trueIn PDF document text
    • https://e474413f-ff6d-4b46-a00c-d4c33541206b.filesusr.com/ugd/ddecc0_2d950752889f40849320f83e1b526292.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/ok_google_weather_report_for_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94340369-42d3-499e-a308-5da1735acd2f/19300185623.pdfIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_cbda207453f14f8f9dd6eb737603c027.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/punurum/love_languages_quiz_gary_chapman.pdfIn PDF document text
    • http://tixenolas.epizy.com/chromatography_viva_questions.pdfIn PDF document text
    • http://wosezime.epizy.com/cae_exam_speaking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d78d10a-1de6-4619-9ec2-cf6f96aa3b08/what_is_principles_of_compiler_design.pdfIn PDF document text
    • http://pumajuxav.rf.gd/call_of_duty_2018_apk.pdfIn PDF document text
    • http://rijogutigoxek.epizy.com/bts_song_albums.pdfIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_60ee892e841f430e8edef7d4ac23b66d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cbd315a-7aa5-4faf-a95c-f7619faeb2df/51611745688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a57a98f6-fa0c-4fe4-a9a6-70acb042f9aa/a_prismatic_beam_fixed_at_both_ends_carries_a_uniformly_distributed_load.pdfIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_7b12da7b0a4e40d395875ae817798e60.pdf?index=trueIn PDF document text
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_5eaa6fe2879749da92760966825e771b.pdf?index=trueIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_9dfd1bdeec2a43ebadc4bff1a46190af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d6c898d-68e6-4a3a-aaed-743b4d35dc46/zazarobubusupuwe.pdfIn PDF document text
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_de801114498948deb2981a25c5622a09.pdf?index=trueIn 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_off00012ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC0 3044 bytes
SHA-256: 0a4b5c31f4257e5a2707017370dcf829c84058060820f6748bf1d2aeb2c81f0e
font_01_sfnt_off00013994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13994 5276 bytes
SHA-256: a808fc554218c48a8e8ae149eb48e9680f2310c052af202d3c7978d0904a9c34
font_02_sfnt_off00014ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA3 11132 bytes
SHA-256: f2416b1c8816265e0962c491c7555aa8b9c6413049d14d9e37c5e6fcac474f2a