Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d9ba3686df01471…

MALICIOUS

PDF

77.4 KB Created: 2021-04-07 01:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb1b2b006ce550a865c5e31070a40987 SHA-1: 5931d0cce2c95887438cd065de26b7006bc8055a SHA-256: 2d9ba3686df01471bcde319dac9b6de79abdc08a43a79edd2f60e98c56ca8992
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 SEO-themed, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=chris+craft+launch+25+owners+manual
    • https://static.s123-cdn-static.com/uploads/4393785/normal_5fe41bc0ccce6.pdf
    • https://pebezudaxefen.weebly.com/uploads/1/3/4/3/134347708/wosafoxox_pupamakuwi_tatuladufi_pebofifamaki.pdf
    • http://hushseo.online/why_is_my_dryer_not_heatingve1x3.pdf
    • http://daating19.site/dell_xps_15_7590_spec_sheetcxx6x.pdf
    • http://prizyivnik.ru/bitasatiminagugowugazoro5y719.pdf
    • http://prodson.space/how_to_decorate_a_christmas_tree_professionally_with_ribbonktksn.pdf
    • https://cdn-cms.f-static.net/uploads/4448556/normal_5fe9f7815d7f1.pdf
    • https://nevedaroxizewav.weebly.com/uploads/1/3/4/5/134592578/ef40ca.pdf
    • https://wopuwidutava.weebly.com/uploads/1/3/5/3/135322166/lurozuwumozil.pdf
    • https://rezezeveg.weebly.com/uploads/1/3/1/8/131871466/7b71ab908b25.pdf
    • https://static.s123-cdn-static.com/uploads/4377120/normal_5fe3d9d1582c5.pdf
    • https://revasarubon.weebly.com/uploads/1/3/5/2/135295272/zigig.pdf
    • https://wizisenax.weebly.com/uploads/1/3/4/3/134320615/jotuzonisisaki-rugikuxus-tefanipaxigak-xebafevutisorun.pdf
    • https://static.s123-cdn-static.com/uploads/4417528/normal_600355fd970c2.pdf
    • https://wujibinofowe.weebly.com/uploads/1/3/1/3/131383737/49ef54d238.pdf
    • https://cdn-cms.f-static.net/uploads/4454287/normal_6063d47be0e06.pdf
    • http://printrbot.com/shop/assembled-simple-metal-with-heated-bed/FDM
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_80594467fc46408b8f2d05983a3a0127.pdf?index=true
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_919ca9a0a5d8401e9d269c3900676c30.pdf?index=true
    • https://058da8ce-bb30-4b8c-81eb-8903018cac65.filesusr.com/ugd/ab745b_65bd01690f3642b692d93acab431809f.pdf?index=true
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_3e828c7971034be2b37159b8fa615789.pdf?index=true
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_4133ce3300944571baf726ff3abb13cc.pdf?index=true
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_f803a91419bc49d89fe01618df67be7c.pdf?index=true
    • https://4da44922-6ee1-4515-aed7-54c3d6b51f77.filesusr.com/ugd/243a28_62025de471f7437c9ae05946c3c47cb8.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_off0000ee31.bin
c6c67f21e088a0b52cc905634f0dba8228018ce57194905b760167db5914d47e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 5376 bytes
font_01_sfnt_off00010063.bin
64c533d2d96f5656d4131d37ba4108325fe53222b53b573a18d5ba47fef1b159		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10063 11444 bytes

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