Malicious PDF — malware analysis report

Static analysis result for SHA-256 40743a500526397b…

MALICIOUS

PDF

74.9 KB Created: 2021-04-08 15:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d7b03bbaa00597a959ce181b80689781 SHA-1: e94026ef679307a9a79d169bc7de4f9b0f2fb2ef SHA-256: 40743a500526397bd984d6c547c896f14183906a935c8d1ab31baa9fe4a97170
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=ice+breakers+games+over+zoom PDF link annotation
    • http://insurancesouk.com/55826131818fvt03.pdfIn PDF document text
    • https://cdn.sqhk.co/xaripisi/Wgcghgh/98576969762.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/87237424322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411702/normal_5fe9e37351731.pdfIn PDF document text
    • http://lagidonak.mygamesonline.org/96728820248.pdfIn PDF document text
    • http://jisutuxoxaza.medianewsonline.com/dasodefimanetu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390074/normal_5fecf96c9db79.pdfIn PDF document text
    • http://ewwe.space/uconnect_headphones_replacement_battery_covera8z1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385230/normal_601d291fccd4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384464/normal_5ff1806f3dbef.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/gdzCibK/dead_effect_3_mod_apk.pdfIn PDF document text
    • http://plsale.pro/305670280970hoz4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460690/normal_6024ef5d6e50a.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/Rib0gc8/poached_egg_cooker_kmart.pdfIn PDF document text
    • http://6gusevshop.space/59142234619wuxyb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460071/normal_5fef185118352.pdfIn PDF document text
    • http://dixajadabaw.66ghz.com/xuwapaluzulesipoxeson.pdfIn PDF document text
    • https://cdn.sqhk.co/jerowerar/jjKFjdI/dip_master_jordan.pdfIn PDF document text
    • https://cdn.sqhk.co/xonarewu/2iijcit/the_yellow_wallpaper_quotes_about_the_woman.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375885/normal_6050bb24158ba.pdfIn PDF document text
    • http://blancer.xyz/bloodstrike_map_cs_1._6_freejsbjc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kepelagivon.rf.gd/solid_waste_management_project_for_students.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_off0000e86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86A 5340 bytes
SHA-256: 40e9d785c18ac39a4f33ecf645bcc5f57c318e09d1bd965a19519298db355508
font_01_sfnt_off0000fa90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 10572 bytes
SHA-256: c176045e77838ce6195a4f7be1c1cb299de2049bd769c89090dc4a8a4b3c7ae0

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