Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ac3c4f838fe658…

MALICIOUS

PDF

70.8 KB Created: 2021-04-22 23:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d4be5efc978293e02fa4752d67e6e4b SHA-1: 167aad3e13d77da1b15daf8b47c20384b184165c SHA-256: 88ac3c4f838fe65847b077e102817a7b6bf4d3af09469ff0ad5d39ecb545e232
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to direct users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure itself is used to host and present these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=kyocera+duraxt+e4277+sprint
    • https://cdn.sqhk.co/lewoxiguj/zffdiii/fifotas.pdf
    • https://boxagabopevonud.weebly.com/uploads/1/3/4/3/134353696/b2dd94.pdf
    • http://itdiscount.info/30773503704krojy.pdf
    • https://gikopefexibog.weebly.com/uploads/1/3/0/7/130775531/93345e0e605cba.pdf
    • https://cdn.sqhk.co/solalokazili/jciiFig/crash_drive_2_mod_apk_3._70.pdf
    • https://kuwugexikoxol.weebly.com/uploads/1/3/4/7/134718068/3992869.pdf
    • https://cdn.sqhk.co/zuxifobiro/hh6jhcZ/reporting_entity_l_g.pdf
    • https://cdn.sqhk.co/zovitamojim/ajcOgcF/business_relationship_manager_en_francais.pdf
    • https://cdn.sqhk.co/gafisasiwu/AjcjikO/blood_pressure_medications_that_start_with_l.pdf
    • http://national-verifyteam.com/tomomikawodosudazesapa49aj2.pdf
    • https://cdn.sqhk.co/konidadelan/cx3jf5Y/reckless_getaway_2_android_1.pdf
    • https://cdn.sqhk.co/gusiloxi/Mib9hfR/lezajanobab.pdf
    • https://vujebitaj.weebly.com/uploads/1/3/4/7/134759162/87a07b1.pdf
    • https://pumaxodevuk.weebly.com/uploads/1/3/1/8/131872084/beninamo.pdf
    • https://cdn.sqhk.co/felebamifuk/jfjaqjb/prison_break_cast_season_1_escapees.pdf
    • https://dowisapi.weebly.com/uploads/1/3/4/2/134266119/a64e1b17.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_75d2613fc1384c1b9fef3e313fe86257.pdf?index=true
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_2ba6417453e14b9f944f896db9f73af6.pdf?index=true
    • https://229c0a76-8cd2-4a6d-ad64-a548a1436bbb.filesusr.com/ugd/f9ed01_84775b40072d437f8d2050916922ed30.pdf?index=true
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_54f0a19dd4424c3ba7f167b6f1267371.pdf?index=true
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_082009e760ef4070a1caf733d9257d0e.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_off0000d701.bin
a27e66d86faee3736445b93811b28d9988d4262a23f6e62bde0e6cf0c7c59557		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD701 5472 bytes
font_01_sfnt_off0000e9d6.bin
d50916e490ee97fd4699464fd658090682c0d4caa0e5029843d8a47b21b5c954		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D6 10584 bytes

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