Malicious PDF — malware analysis report

Static analysis result for SHA-256 939c45da3cc97d01…

MALICIOUS

PDF

81.6 KB Created: 2021-04-06 09:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de4e5870b8310eb513ba8b107b52ac57 SHA-1: 01a2a34ac9949f8ee9d90bd4a830ca7ab44e0f02 SHA-256: 939c45da3cc97d01f7798fe3f218cff761cf31eccacb89548dbac69396da02cb
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 of which point to SEO-optimized content, suggesting a link farm or phishing attempt. The primary malicious URL identified is mezovuduw.ru, which is likely used to host malicious content or redirect users to a phishing site. ClamAV and ML classifiers also flagged this PDF 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://mezovuduw.ru/aws?utm_term=how+to+connect+canon+pixma+ip100+wireless
    • https://cdn-cms.f-static.net/uploads/4422877/normal_60550471d646e.pdf
    • https://static.s123-cdn-static.com/uploads/4380392/normal_5fd084c4ca0a5.pdf
    • https://cdn-cms.f-static.net/uploads/4455375/normal_5fe84c60eae85.pdf
    • http://loduwij.scienceontheweb.net/guramebuxadosodipowutu.pdf
    • https://cdn-cms.f-static.net/uploads/4505326/normal_602258d0ec8fd.pdf
    • http://zugobopepoj.sportsontheweb.net/overcoming_anxiety_and_depression.pdf
    • http://rawoxaxevog.mygamesonline.org/45651717125.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e3a57f90-06e3-4e69-ae42-c8312a0aaa13/element_32_led_tv_reviews.pdf
    • https://uploads.strikinglycdn.com/files/941cd5d7-d81c-4ffd-be3a-3a06c3eb700f/rinnai_gas_water_heater_specifications.pdf
    • https://s3.amazonaws.com/zidosozawok/28860951360.pdf
    • https://s3.amazonaws.com/libowebujakux/suvaki.pdf
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_3c72cb2452cf4ebaabf5b48bd6c22756.pdf?index=true
    • https://s3.amazonaws.com/jevopemosod/why_is_the_filter_light_flashing_on_my_dyson_v10.pdf
    • https://uploads.strikinglycdn.com/files/46f7beb8-efcd-47de-bf64-9d688b3b79f6/dometic_duo_therm_brisk_air_conditioner.pdf
    • https://uploads.strikinglycdn.com/files/67866101-6f0e-4b2b-b76f-4bd0c682d23a/17194908867.pdf
    • https://uploads.strikinglycdn.com/files/3925d51f-d860-4ed3-978b-4d0481a07f27/sidivadezotogekoliw.pdf
    • https://uploads.strikinglycdn.com/files/632a9fb6-cacf-4a1a-bbff-143dd7292056/63093080564.pdf
    • https://s3.amazonaws.com/nuxepiduded/d_link_dsl-_2730u_software.pdf
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_ebd8c25ffab443e79b05c2eef1f551a3.pdf?index=true
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_52a69e49cab44db7bcb1d0aa28e0c275.pdf?index=true
    • http://tiwatimab.atwebpages.com/fallout_4_companion_guide_likes.pdf
    • https://504b7f7c-d27d-4f2b-a6eb-e8dc7cf660cf.filesusr.com/ugd/6ba015_83603234cd0b47b385cbf34bf0671695.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_off0001010f.bin
3b5ce0f81dfff8eb6325dd6462ca0dd2ada58d723822bc8cd4a3e10259f7ad15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1010F 5392 bytes
font_01_sfnt_off00011366.bin
da310eca1cf0a1e7fad397663493852a60e3b8d6521b41d540b1bdec98f9593a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11366 10912 bytes

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