Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcaba8612200110…

MALICIOUS

PDF

88.1 KB Created: 2021-03-06 04:51:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d9b58ebf9c480ac7aeea933aa5af9e76 SHA-1: 3f98397ca3e94712908fbd6080202a3d2b9dcc2a SHA-256: efcaba861220011015faeede6151a1637b00660e09a57c223328e6e4b226afe9
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://baarspo.ru/strik, which is likely used to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://baarspo.ru/strik?utm_term=how+to+tell+if+lawn+mower+carburetor+is+bad PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379844/normal_5ffec1226c12e.pdfIn PDF document text
    • https://lexixare.weebly.com/uploads/1/3/4/3/134354354/gipalawodewaniw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401538/normal_6014957664d87.pdfIn PDF document text
    • https://xijadusulotogu.weebly.com/uploads/1/3/6/0/136089771/469197.pdfIn PDF document text
    • https://zojopufowe.weebly.com/uploads/1/3/4/5/134523349/9724375.pdfIn PDF document text
    • http://setovewurepenu.22web.org/77900557566.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e8dc820-5748-45ec-8093-7c122908218a/82958016038.pdfIn PDF document text
    • http://lozadubevapoke.epizy.com/lea_primary_school_harpenden_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/antigona_rozbor.pdfIn PDF document text
    • http://nonulalomijowo.epizy.com/najatotuvaliwowosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92409dae-084b-4c02-a8ec-e18dd4c03dd7/sigmund_freud_theories_of_personality.pdfIn PDF document text
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_fd8e6bd2ce5c4f1890524287bc5e9243.pdf?index=trueIn PDF document text
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_2bdcd51a135d445895ea8d170a016c94.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d72fe3-39da-4346-a085-c0a8fdbc86e0/xisovevalurum.pdfIn PDF document text
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_2b2e5a212a8046e195e43646000d644a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/topamogofi.pdfIn PDF document text
    • http://wovefekekixuji.rf.gd/powerpoint_templates_computer_science.pdfIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_408cc4c912234903afd2d5aad471136b.pdf?index=trueIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_275a971553e747d6a0fedc23a48c0c6b.pdf?index=trueIn 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_off00011ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD1 5360 bytes
SHA-256: af166ee1fe0e5e275f2cc4ced1cd40aaf12dd4a54361072d33db2d5070ef36b6
font_01_sfnt_off00012d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D00 11080 bytes
SHA-256: 62cf568559ed7775c491461b1b8684d6f46696eabf71e023e3f21c5377627604

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