Malicious PDF — malware analysis report

Static analysis result for SHA-256 335d52217a74288e…

MALICIOUS

PDF

81.1 KB Created: 2021-03-19 08:08:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85ec9f76596d838a2e10bc96599ff74a SHA-1: 7066924cd76a2f54cdb07f31b1e11a0415f83f07 SHA-256: 335d52217a74288e527a34134d26ea9aecd778356db4d9b6a865ae5bb4583725
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and a machine learning classifier, with heuristics indicating it contains a large number of external links, a common tactic for SEO spam or phishing. The embedded URLs, such as 'https://seumenha.ru/wix?keyword=ts590s+user+manual', suggest a lure to a potentially malicious site. Although no scripts were explicitly extracted, the PDF format and the nature of the heuristics suggest potential for embedded JavaScript or other exploit mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=ts590s+user+manual
    • http://odemebayisitrafik.com/country_line_dancing_steps_sheetstgvig.pdf
    • https://cdn-cms.f-static.net/uploads/4370275/normal_602e12e78cb3f.pdf
    • http://7lessons.fun/a_christmas_love_story_choir_castowrwh.pdf
    • https://cdn-cms.f-static.net/uploads/4465128/normal_6050d84a9d5e2.pdf
    • http://itasda.online/caveat_application_format_in_marathi6na6o.pdf
    • http://stavki-na-sport.site/kexezutofumujejay00m0.pdf
    • http://hytri.com/bhop_pro_apk_oyun_indir_clubl2msc.pdf
    • http://formulamoney.top/how_to_reset_an_asus_routerm192x.pdf
    • http://idealica-uficialeitalia.website/how_to_program_my_honeywell_thermostat5jww3.pdf
    • http://befujukipepejem.mygamesonline.org/30266747957.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_251d2af79cb7455fb8ff42df02a08bbd.pdf?index=true
    • https://8717ace1-8174-44a1-9f98-e7cbf9e9ed94.filesusr.com/ugd/14e3be_382309ff73a246a5bd28d3e5d9e144d6.pdf?index=true
    • https://8acf0fc4-2da8-4686-9788-d7840b5449fc.filesusr.com/ugd/fab691_5e6b2b48bff74f108e43634c3456a102.pdf?index=true
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_dd668e0970ed4206864fa0239d5509e8.pdf?index=true
    • http://sagoralezerelo.onlinewebshop.net/sustainable_design_principles_in_architecture.pdf
    • https://041f977c-1598-48cb-b578-3d63f550c8ab.filesusr.com/ugd/524ae3_725edad59bf54e5691fe95e276426387.pdf?index=true
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_5c2f34297f394d83a4b0ddcd2b9d05c7.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_off0000fe93.bin
df2bb29c16bed99cf9a056aaae086337f427324c836a685e690452d1dfc9b044		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE93 5204 bytes
font_01_sfnt_off0001102a.bin
9e4f5d360dfc05aeef262f042947d3d2ccba9b3944c96a12f711af918c69ff62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1102A 12092 bytes

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