Malicious PDF — malware analysis report

Static analysis result for SHA-256 6915301d828f617d…

MALICIOUS

PDF

89.8 KB Created: 2021-04-03 03:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 436125710a000afa5eb534c3f3e75d43 SHA-1: d0f6b8f69577aff4380943db9500d2d98fcceafc SHA-256: 6915301d828f617d0708d8a5236d2d1a0eb121fe94664df376d60a686d727631
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating it hosts a large number of external links to other PDFs. One of these links, 'https://golowaki.ru/award?keyword=cantoral+liturgico+nacional+partituras+pdf', is flagged as an external URI. The ML classifier and ClamAV also identified this PDF as malicious, suggesting it's part of a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/award?keyword=cantoral+liturgico+nacional+partituras+pdf
    • https://static.s123-cdn-static.com/uploads/4419828/normal_5ff9a896e6199.pdf
    • https://cdn.sqhk.co/wazikunal/Jghjbje/toolbox_mod_minecraft_1._12._2.pdf
    • https://static.s123-cdn-static.com/uploads/4452154/normal_600611b5229c0.pdf
    • https://cdn.sqhk.co/jujadiziga/SjerWjd/htc_backup_app.pdf
    • https://sinekagu.weebly.com/uploads/1/3/4/8/134855021/6c2575b.pdf
    • https://cdn.sqhk.co/dekaroku/cibAiiX/scary_teacher_3d_chapter_2_download.pdf
    • https://cdn.sqhk.co/fuzokikili/gdRijhf/47361475109.pdf
    • https://cdn-cms.f-static.net/uploads/4488346/normal_6032f2222bed8.pdf
    • https://static.s123-cdn-static.com/uploads/4412763/normal_5fed9fbfb9d81.pdf
    • https://bodijoso.weebly.com/uploads/1/3/1/3/131380183/265131940.pdf
    • https://static.s123-cdn-static.com/uploads/4383170/normal_5fe33e63763bf.pdf
    • https://cdn.sqhk.co/jokawefezo/qwqsahb/free_bible_study_lessons_for_adults_printable.pdf
    • https://jedarixires.weebly.com/uploads/1/3/0/9/130969076/sumelewuf_kobugi.pdf
    • https://romadixisom.weebly.com/uploads/1/3/2/6/132681692/2425883.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8752767d-1ecf-44ae-93c6-ab55148d7ee5/butudidamurifirepugixiw.pdf
    • https://uploads.strikinglycdn.com/files/4885c261-0c1a-465e-b6cd-2b9fc30184b6/whirlpool_cabrio_4.8_washer_reviews.pdf
    • https://uploads.strikinglycdn.com/files/ce7d4957-bbe3-459b-bff5-8c506943185f/sikebufowefar.pdf
    • https://uploads.strikinglycdn.com/files/ec0ebf00-1c5a-4eaa-8d50-050f587bc7ba/emotion_cards_for_therapy_printable.pdf
    • https://uploads.strikinglycdn.com/files/9295733f-67e0-4a87-874d-aea4989196e5/what_did_jackson_believe_in.pdf
    • https://uploads.strikinglycdn.com/files/18bf3531-93d0-4bf6-ba12-de27ccd0d568/how_does_wix_online_store_work.pdf
    • https://uploads.strikinglycdn.com/files/5436573f-58df-4428-801b-6b45b9b9148e/selaxexogozosej.pdf
    • https://uploads.strikinglycdn.com/files/caad727f-e2fa-444b-84ea-a2d1a3ca1d83/26592964198.pdf
    • https://uploads.strikinglycdn.com/files/24b40c3d-4c29-44ed-afff-797ea1960432/jelaroxox.pdf
    • https://uploads.strikinglycdn.com/files/cb3900c4-354c-4754-926d-5e0b609e4747/62892396826.pdf
    • https://uploads.strikinglycdn.com/files/458a2629-f0b9-4bed-9396-d2021ad6a46e/logical_puzzle_questions_with_answers_in_hindi.pdf
    • https://uploads.strikinglycdn.com/files/68355a74-6b6c-47f4-b01f-65352bc4772a/7817540544.pdf
    • https://uploads.strikinglycdn.com/files/7cf51e52-4d1b-464f-9406-8160b1ba89ff/ramidovelojogeb.pdf
    • https://uploads.strikinglycdn.com/files/dfe3ed4b-346e-4378-8e94-fbe549ac886b/quran_english.pdf
    • https://uploads.strikinglycdn.com/files/c6fa4cff-a5ae-44c6-8754-d8780bc79464/what_is_bear_in_native_american.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111c6.bin
9ac8612f522c44bb4b538d2b86b5701321133ed6182c2a849a0ac7a1ad147812
pdf-font-stream PDF embedded font (sfnt) at offset 0x111C6 5108 bytes
font_01_sfnt_off0001232c.bin
0757170d58f92e9958e1c66011c849befd67d0a49ad41578e3b510cd918c6f90
pdf-font-stream PDF embedded font (sfnt) at offset 0x1232C 11620 bytes
font_02_sfnt_off0001494e.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1494E 4324 bytes