Malicious PDF — malware analysis report

Static analysis result for SHA-256 a536ed178acd70fe…

MALICIOUS

PDF

84.0 KB Created: 2021-06-08 20:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3472cfdde9cd08b04184e895f61f172f SHA-1: d95329fdce89bc8bcddb2671cc285a52f40bb9dc SHA-256: a536ed178acd70fe326de49633673cfaff64bbd3f19dbbe758fbd0c3eec03f10
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to Weebly-hosted PDFs, indicative of a link farm or phishing campaign. The presence of 'Urdu font apk' in one of the URLs suggests a lure to download potentially malicious software or credentials. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://queure.ru/pbw?utm_term=urdu+font+apk
    • https://fuvepuzineg.weebly.com/uploads/1/3/4/4/134463404/jobuxumivata_jeroki.pdf
    • https://pakitaxe.weebly.com/uploads/1/3/4/3/134318313/domadugusepuwafo.pdf
    • https://cdn-cms.f-static.net/uploads/4421768/normal_605b5191d85c7.pdf
    • https://vusexojepaxeva.weebly.com/uploads/1/3/4/0/134096357/bf085806.pdf
    • https://goreduve.weebly.com/uploads/1/3/2/7/132740848/4137878.pdf
    • https://cdn-cms.f-static.net/uploads/4392457/normal_60325812637f0.pdf
    • https://zakemobuka.weebly.com/uploads/1/3/0/7/130775752/supuzaxov.pdf
    • https://cdn-cms.f-static.net/uploads/4450870/normal_601149cf5e43a.pdf
    • https://rekasefuwe.weebly.com/uploads/1/3/0/9/130969231/603291bb20f.pdf
    • https://cdn-cms.f-static.net/uploads/4412165/normal_5fd27deb873f1.pdf
    • https://bomoforelad.weebly.com/uploads/1/3/4/0/134012732/suduzowavar.pdf
    • https://gukegibulu.weebly.com/uploads/1/3/4/6/134668459/sibenuvetofif_konufit_vanuzuboves_xetosuli.pdf
    • https://static.s123-cdn-static.com/uploads/4450504/normal_5fde6e2c84502.pdf
    • https://cdn-cms.f-static.net/uploads/4369901/normal_604ab9484ffe8.pdf
    • https://wotopegajoxife.weebly.com/uploads/1/3/4/0/134042499/kegimibovut_masalotaz_pipurez_xolavavigafobi.pdf
    • https://cdn-cms.f-static.net/uploads/4410013/normal_602ca1e9eeefb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://keborekudud.pbworks.com/w/file/fetch/144686877/incredible_english_2_teachers_book_download.pdf
    • http://nusuwoxub.pbworks.com/f/30753926711.pdf
    • http://xedidovetaw.pbworks.com/w/file/144411246/how_do_you_change_your_voicemail_password_on_android.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
    • 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_off0000e94b.bin
953c3da4042eccf4dacd428f18d0ec6e05d29fa30dc47df2ca210a6bf75ba513		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE94B 4596 bytes
font_01_sfnt_off0000f8ee.bin
8141a2d5622a45fe886dd227e2cf5dec6d5469de80b21db5cd8e855a333ab4af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EE 11348 bytes
font_02_sfnt_off00011fd6.bin
a3b8ae6cb61a975f1aaa3bdf1d75290c2750726bc6c8d8b6ec62e4e9f5cc9978		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD6 16084 bytes
font_03_sfnt_off0001348c.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1348C 4324 bytes

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