Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b5a21ad46cfd9d…

MALICIOUS

PDF

97.5 KB Created: 2021-03-16 06:44:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2dda51e4ec5f401331fb926873dcdd0 SHA-1: 786b2fcd42ca3b85d0eae4c1dac26fd67cd6b217 SHA-256: b1b5a21ad46cfd9ddc31bc1067e8664f62b917a4bc786990ba253b7aa341b6b4
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 point to suspicious domains and are likely part of a link farm designed to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://resalured.ru/wix?keyword=introduction+to+programming+languages+chen+pdf
    • https://cdn-cms.f-static.net/uploads/4412773/normal_604742e351855.pdf
    • http://lifeit.pro/huawei_e5573_specificationijane.pdf
    • http://50off.pro/963925183081r1lp.pdf
    • http://rezltml.xyz/wunigarevopewelaxugufaguyqd5e.pdf
    • https://static.s123-cdn-static.com/uploads/4451352/normal_5feb2d1d0eb16.pdf
    • http://copyright-helps-team.com/7817248677m2szd.pdf
    • https://vominitaxa.weebly.com/uploads/1/3/4/6/134677623/e521a13590.pdf
    • https://ruzutemeba.weebly.com/uploads/1/3/2/6/132681300/bamiwarudosifev_tisap_nulewesaw.pdf
    • https://cdn-cms.f-static.net/uploads/4428033/normal_604dd8f53c859.pdf
    • http://dontbeshy.xyz/eldritch_knight_5e_spells_guideewifk.pdf
    • https://mogisitubetaw.weebly.com/uploads/1/3/4/4/134496388/1287328.pdf
    • https://peniseguj.weebly.com/uploads/1/3/2/7/132712198/zarugid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_e19f66738b064d80b81fdbc48c16f833.pdf?index=true
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_2340312a4e9249beaf6742c73018e62e.pdf?index=true
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_9a4c7d5c75fe42a3abb1f0051f0b6a34.pdf?index=true
    • https://s3.amazonaws.com/kosamupim/android_os_latest_release.pdf
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_dc32e53c08044214b8fdc0396952173c.pdf?index=true
    • https://s3.amazonaws.com/futamo/64223108282.pdf
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_f564a1d248cc4e3d857c47f5dce09cd1.pdf?index=true
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_af9424a6e2814d7eadd459eebe70d74f.pdf?index=true
    • https://s3.amazonaws.com/fukezavazuj/71336741543.pdf
    • https://s3.amazonaws.com/wudibirewuduto/21676137580.pdf
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_89a7cb78dcbd4cc6bbb5c4c4dffa1053.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119f6.bin
7278ed2924031f7cb48accbee7c336b7b30468630b79de79cd3589013bd2d2c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119F6 4016 bytes
font_01_sfnt_off00012822.bin
f85c35ec0d40494880c0f5374ba3bf14ad1b171f8a00a0fa967cb3adab279b40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12822 5504 bytes
font_02_sfnt_off00013aaf.bin
6887b291c07056ecab95a01130754271ff406afaf96bb11dd575b83daa0a70fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAF 11612 bytes
font_03_sfnt_off000162b7.bin
f469c5aa689aa4c1965481b78cfaebbf1c3ebdad2306c7067134b7b4aaa0addd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x162B7 16164 bytes

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