Malicious PDF — malware analysis report

Static analysis result for SHA-256 81562a91f7f6d2ea…

MALICIOUS

PDF

73.3 KB Created: 2021-05-22 09:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7b490e8d9aafe6cfde90d6021d9d5b90 SHA-1: 19421f3ce5607f8fe70517cc246c896b27373cdf SHA-256: 81562a91f7f6d2eafe63715d2877952b0cff6baac414e48c88885fc0257a0770
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jottigo.ru/strik?utm_term=jobs+at+covid+19+testing+centres PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477376/normal_6056a7b7dab4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387430/normal_60090a0f05cf1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387589/normal_5ff63a5f7dd4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450350/normal_602aaa64271d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491148/normal_602bde462ac14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473651/normal_5fe8ba89bf3ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465539/normal_5fe7ebf592b4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468296/normal_5fff0634221a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410679/normal_5fff4f6f38232.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366000/normal_5ff09402de6c3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xokebore/mizagagekufotutavegil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d39b6ab-76a8-4283-b7b8-587c2cf6f2fb/what_is_science_of_logical_reasoning_test.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/22853369181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3aa7abe-19c9-43ca-bf4f-8f6e86afc8c5/pedodegopunikatapimi.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/32395717901.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/gojebukowusawa.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/revosojubet.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/5089758908.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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB2 5472 bytes
SHA-256: 7a5fcd64eefddaf64176085bbfeacb6e9c3c5224373f5a43625f86fc858e0c18
font_01_sfnt_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 10940 bytes
SHA-256: b4951192ecd18bf7cfcbabf14499fd02dc1b36e6b09b471d30809aebd60241f7

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