Malicious PDF — malware analysis report

Static analysis result for SHA-256 00c583ce63e8f172…

MALICIOUS

PDF

73.0 KB Created: 2021-03-31 10:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c539469d40df32f55c11be4d93e02ee9 SHA-1: 905faf0a2e7f7159e579b729a993c8ff425d34b0 SHA-256: 00c583ce63e8f17250742e9379cdaf0203e7c58d66a869aa2f4b731a75759054
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dafemum.ru/strik?utm_term=how+to+unglue+a+pvc+elbow
    • https://lojopozubog.weebly.com/uploads/1/3/1/6/131606756/wugofogujide-vomudibimamaper.pdf
    • https://nulosumewure.weebly.com/uploads/1/3/4/6/134645663/jaxidep.pdf
    • http://raisinsapp.pro/5005799467812g62.pdf
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/gizeg.pdf
    • https://cdn-cms.f-static.net/uploads/4378153/normal_5fd86b680cbc8.pdf
    • http://ideal-it.fun/birthday_cake_decoration_designs2w7zb.pdf
    • https://static.s123-cdn-static.com/uploads/4393183/normal_5ff82f679b58d.pdf
    • https://puroporutenes.weebly.com/uploads/1/3/1/6/131606954/belomij-degosixa-fujazedek.pdf
    • http://makedctl.site/guitar_chord_chart_for_beginners_printable1j55l.pdf
    • http://haustova.com/test_htp_interpretacionoeb5u.pdf
    • https://sexewowoko.weebly.com/uploads/1/3/0/8/130873923/depigawolodupij_lisedefevore_fawizowegivu.pdf
    • https://cdn-cms.f-static.net/uploads/4484365/normal_600e8f6506bad.pdf
    • https://cdn-cms.f-static.net/uploads/4489983/normal_603a16c66b586.pdf
    • http://ebay-coupon.ru/wolodunipuxesuvinlq7bn.pdf
    • https://cdn-cms.f-static.net/uploads/4443326/normal_603aa84b7bbd2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_c80068508a8149738322e73559b33a63.pdf?index=true
    • https://411563d6-f1a1-4768-9eaa-86e4eb1f1ae3.filesusr.com/ugd/6d8349_2ececd6cb94f4ca1a501ac6bf43691a2.pdf?index=true
    • https://cb0920a4-0dfc-4587-8161-bd3bf883b043.filesusr.com/ugd/df391a_6862c24fd8544880bd273a3c7426323b.pdf?index=true
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_04af988681124e0ba65f98047cb7f0ef.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7bc3540d-3c71-4202-933f-1587ee9b895a/51214021397.pdf
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_c6c6ab8579794e079472fa190336d4ea.pdf?index=true
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_b3650920b8cf4fe8a1e535bbb9d13b64.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9cef6aa0-9ddf-4e8e-9d46-9fd622be3d26/the_pact_jodi_picoult_movie_trailer.pdf
    • https://uploads.strikinglycdn.com/files/15040aa3-0443-422d-b581-3a4530445a9e/gigabyte_d3306_motherboard.pdf
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_f7b2a7cfb52d472eaadc55a7bb32d275.pdf?index=true
    • https://uploads.strikinglycdn.com/files/112d396e-9ee5-4103-98f7-5455c9560ca5/the_odyssey_part_2_study_guide.pdf
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_8057433e7ba44cec9fa88dbbaeafd643.pdf?index=true
    • 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_off0000e1d9.bin
b27256b2fc086528b9c75046910ddb2d615529e70d3f71dbe7f254cdaf2f1e88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D9 5080 bytes
font_01_sfnt_off0000f354.bin
1759136a2cb02803e26df4653087def1f7501fbc4a9fc5839d0aaa9b1ad41a2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 10268 bytes

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