Malicious PDF — malware analysis report

Static analysis result for SHA-256 47347737cea66cbe…

MALICIOUS

PDF

108.0 KB Created: 2021-04-07 18:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f37181177fafa6335cc2ed6de20186bc SHA-1: dfb032a7175364c6dae249168a54f356324b2bb1 SHA-256: 47347737cea66cbe0a00b4b6ae531ec3f6575e56a34a9b7b890f4d845e514cce
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one pointing to 'maypoin.ru', suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support the attack pattern of directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://maypoin.ru/wix?keyword=%25D9%2585%25D9%2588%25D8%25A7%25D9%2582%25D9%258A%25D8%25AA+%25D8%25A7%25D9%2584%25D8%25B5%25D9%2584%25D8%25A7%25D8%25A9+%25D9%2581%25D9%258A+%25D8%25A7%25D9%2584%25D8%25B1%25D9%258A%25D8%25A7%25D8%25B6
    • http://winclean-shop.space/bruce_lee_video_songs_djds1a8.pdf
    • https://cdn-cms.f-static.net/uploads/4421640/normal_606d56b956d90.pdf
    • http://lnstagramlivesupportcenter.com/apologetics_questions_and_answers87je3.pdf
    • http://akmurzina.com/the_end_flatline_hot_sauce_reviewozjz3.pdf
    • http://zootime.store/diono_radian_3qxt_width6eo5p.pdf
    • http://cmb-societe.com/gajozutuloxijujexesaboj8856.pdf
    • http://nubolutlion.xyz/suzafakutepofazarasufoda79yew.pdf
    • https://cdn-cms.f-static.net/uploads/4485821/normal_604d1b7b81dc5.pdf
    • http://artrosil.xyz/72323570060flwwp.pdf
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5fda6e1c54527.pdf
    • https://cdn-cms.f-static.net/uploads/4376359/normal_6028fb7c99273.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_6039ef3314604d71bb246e85bd328e17.pdf?index=true
    • https://559ef5b4-38f4-491c-95f5-a6f57f0534fb.filesusr.com/ugd/1b862a_fcf22ee7791a4490b9a916ac9c30add9.pdf?index=true
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_6beb083922284b22957641e5ed100432.pdf?index=true
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_2f8fd406493d4d108448fc4980355d78.pdf?index=true
    • https://9e0ebcba-7e04-41ac-afc6-cfc574163c15.filesusr.com/ugd/6725b5_749f091db45a4aa2b614ea24fee9458d.pdf?index=true
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_5a3dfd4a47b345e991cf36256388cea4.pdf?index=true
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_7615813249374ed2925f492d343ea004.pdf?index=true
    • https://75edee45-cd08-43cb-a752-0c33e5c2343f.filesusr.com/ugd/a7c173_cc42b59eec0c464697076634f317e816.pdf?index=true
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_6056f19296884b488c84002d9a68ad4c.pdf?index=true
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_19f72285d04143ae8122cfa104cc88b4.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015aba.bin
c6c63c49323d2e4836e3312d355f83cf1c74984bcded431b9fabd82cbe6592b7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15ABA 30436 bytes
font_00_sfnt_off000113a3.bin
11f6e6e7486fb56e1c1a6a161460869059af7727a1b3c209816032ce5b1596d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113A3 3396 bytes
font_01_sfnt_off00011eab.bin
32b54dafdcc850667a10ff47730fa7e057ef5999e2f39c18a0ab2a2232a63853		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAB 9380 bytes
font_02_sfnt_off00013efa.bin
b81bb8b3d652f75ccc970c7577b917278f90bf41dc9eee405ca18178290a542a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EFA 18156 bytes
font_04_sfnt_off00019118.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19118 4324 bytes

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