Malicious PDF — malware analysis report

Static analysis result for SHA-256 07ea8e69a9c6628c…

MALICIOUS

PDF

95.0 KB Created: 2021-03-16 22:23:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 864cdb3fe1a02d9b55fcc8b109391853 SHA-1: 5751402780f59dbeb3a84a89021766e9e4091342 SHA-256: 07ea8e69a9c6628c3f8aa5abb484c99ae4b2e6b77a782d96dd652d851001e654
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of a large number of external links, including a 'PDF link farm', suggests an attempt to direct users to potentially harmful websites. The document body contains metadata related to 'wkhtmltopdf' and a keyword search, further supporting the lure-based attack pattern.

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/wix?keyword=granblue+fantasy+apk+download
    • http://metryck.info/megalovania_clarinet_sheet_music_solokf3le.pdf
    • http://souve.me/49046917642nb6sm.pdf
    • https://cdn-cms.f-static.net/uploads/4444092/normal_603eeccde0db9.pdf
    • https://cdn-cms.f-static.net/uploads/4393883/normal_60251f1a1aced.pdf
    • http://elerctum.org/cbr500r_2017_service_manualbzyd7.pdf
    • http://xomunuxeju.sportsontheweb.net/halloween_worksheets_esl.pdf
    • http://womenita.fun/87933570478ssnl6.pdf
    • https://cdn-cms.f-static.net/uploads/4411228/normal_6019934a61ffe.pdf
    • http://formverifiedbadge.com/30952776547bom3a.pdf
    • http://duwuzoruperiged.scienceontheweb.net/applied_anatomy_and_biomechanics_in_sport_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://mozutulobiris.onlinewebshop.net/verizon_fios_quantum_gateway_router_manual.pdf
    • http://nupuzawov.onlinewebshop.net/74332389287.pdf
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_30a85af624964ad286bd977111380702.pdf?index=true
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_bccb50df8b964b4cbd895ea95df59cb8.pdf?index=true
    • https://2ad55d82-15d9-4995-b72c-f03dca93b5f4.filesusr.com/ugd/11b7eb_10f255d251b74d1d8c951e9ba831e5ad.pdf?index=true
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_15bd1c3091c4434496f43e4473173394.pdf?index=true
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_3ff9570bdb954eaab8215331808300dd.pdf?index=true
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_3577772a33284fb489ecca65aa44183c.pdf?index=true
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_ced204f3db364efdb675bc3528af084e.pdf?index=true
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_b35b11cc031249f8a20c412c5e5c3d8f.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de91.bin
ea96e51a7f21122745f143b6fbb104ed281d71332c76055256cb2c9ba0f6fe96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 21724 bytes
font_01_sfnt_off00012398.bin
40f7d7f7e0052480fcb133316f2f664130429205ab052de84ab510df0475cb97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12398 5296 bytes
font_02_sfnt_off000135c5.bin
32dd6c938f1b9dd6ac003a79efb5062a07470ac4ac31836cbe596e678c85e15b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135C5 13160 bytes
font_03_sfnt_off00015f81.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F81 4324 bytes

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