Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9c91b23f35f4d5…

MALICIOUS

PDF

70.3 KB Created: 2021-03-15 01:52:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 797e667f4f1bb2b46b9a3ffa478e35fb SHA-1: 527554f7da492ae4049f3e20238121e5a7500fd0 SHA-256: 9c9c91b23f35f4d5176019bbf6ab07c9e1e2ca9dad4ede4909786e2a7235af8e
156 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 a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://xezojetit.ru/wix?keyword=kaibab+lake+fishing PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445104/normal_600d242f4d9e2.pdfIn PDF document text
    • https://zazubutovure.weebly.com/uploads/1/3/1/8/131857419/0913fc66df2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421783/normal_600ca82b45102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392854/normal_602690d4799f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444369/normal_600750fac1a0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460982/normal_6041336206fdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497666/normal_601fd639ec1bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_602c44e4e6467.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443356/normal_5fc684561d8e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448547/normal_60464002de09a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_601ad420e5a08.pdfIn PDF document text
    • https://lupoxever.weebly.com/uploads/1/3/1/4/131413766/kewuratokiwu_supesov_rolixobibudiju_jijan.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/c27ecab2-f711-409b-b3ad-e4e3360898e1/karane.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/word_doc_quote_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/beruxirub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d829183e-659f-49cb-973d-fe88a0228731/how_to_relieve_tight_psoas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/452f8310-de12-4468-85fe-1a6e43dd27fe/audacity_of_hope_audiobook_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ffe8c2c-f993-4951-b8fd-a011af23d280/insinkerator_65_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96d04215-6176-44a0-b450-f4d30a635762/clarion_cz302_clear_bluetooth.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_off0000d6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B0 5108 bytes
SHA-256: 6b4c69c4dabcf42bb98ac016f9a11d0cde556b415a00d8fc870022e6d5edfbcc
font_01_sfnt_off0000e817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 10684 bytes
SHA-256: f71b4282651e94c9c744535913742158624f12f8b0b12fefc3c25f45e676a9bc

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