Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5373ec4213635a…

MALICIOUS

PDF

79.6 KB Created: 2021-04-03 00:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3c864616a91873fd0d196864fc45c46b SHA-1: 49eec7cde2c6ad0f0a93ac06f69589ef70edbcf1 SHA-256: 1a5373ec4213635a9e10485bcd8096eedcc39c51a107b7c971a34c1214176db6
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document's apparent purpose is to deceive users into clicking these links by masquerading as a technical manual.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=john+deere+2140+owners+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471711/normal_5fded9ad3fb3f.pdfIn PDF document text
    • https://gepogixuzusesil.weebly.com/uploads/1/3/3/9/133999736/vitixevet.pdfIn PDF document text
    • http://claire-irk.ru/how_do_i_change_the_display_name_on_my_cell_phone867gh.pdfIn PDF document text
    • https://tenubufaz.weebly.com/uploads/1/3/1/1/131164261/bifilelefuwif-gafifexex-wemuronezoz-tinojapov.pdfIn PDF document text
    • http://storeyou.store/agro_ecological_zones_of_malawie5kie.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370077/normal_5ffb3fc508ac4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465907/normal_604e2844cbba2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412380/normal_5fe903c8014d7.pdfIn PDF document text
    • http://ketousa.site/hijaz_hospital_online_reports0rqu0.pdfIn PDF document text
    • https://lonunirixug.weebly.com/uploads/1/3/2/7/132710494/temuzubiziw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402250/normal_60239c5c18838.pdfIn PDF document text
    • http://ctuxuu.com/840749871663bxyt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493917/normal_5ff3817bc27dc.pdfIn PDF document text
    • https://wufonujixu.weebly.com/uploads/1/3/4/3/134386315/6930282.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365620/normal_5ff0a0d11779e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451567/normal_5fe01a2f22b9a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_cd6f833d633d46278df635b6cd89bbbb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dcf9bc4-9221-4e4a-b74a-5d1c64fb8200/48692254846.pdfIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_173ee3cccff345f88458fa34c735a39f.pdf?index=trueIn PDF document text
    • https://01ff271a-2d66-4e22-ac0f-a796646d2f56.filesusr.com/ugd/8d93e9_e575943d3c864daf97007829710cf223.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f114b56f-20fb-4935-8efb-735a8a21b05c/50193924600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da8df36f-c494-42a5-bb42-1b54cdc5085c/how_to_activate_autocad_2020_subscription.pdfIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_0f95b1566a694dfb999b05cba53ac421.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c06e50d-1ea6-49cb-a6ef-be2f3eb8e9ec/polk_magnifi_soundbar_user_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF770 5560 bytes
SHA-256: 2eca5e17912b7efad6c9db2b0c7589b6b4bc024a0bf463b52b954b2c32e98c94
font_01_sfnt_off00010a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3F 11224 bytes
SHA-256: 00187e916cb3e34d1bd9aac07d6c0991077132fe992944d902ba6ad46943327d