Malicious PDF — malware analysis report

Static analysis result for SHA-256 66edeecb4b81e46b…

MALICIOUS

PDF

67.0 KB Created: 2020-12-01 11:33:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 53c3d11d40c4ff470f7666258f0f71a8 SHA-1: babfc7387d48df80e0b449a79caee21c4985a4eb SHA-256: 66edeecb4b81e46b74e29479408b225046e006b65786748734de9a055f22af56
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged the file as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Carrier aire acondicionado manual pdf', likely to trick users into clicking malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/aws?utm_term=carrier+aire+acondicionado+manual+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4460450/normal_5fc0addfd6119.pdfIn PDF document text
    • https://vifegozotamideb.weebly.com/uploads/1/3/4/2/134236473/1339622.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416149/normal_5f996e06dfdf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_5f9c966c9aa6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378827/normal_5f9cc1b482469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376602/normal_5fbacef7de9cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_5f98db495dfc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402478/normal_5f9a2c3b70e00.pdfIn PDF document text
    • https://xizotikozuza.weebly.com/uploads/1/3/4/5/134587863/2c791cc5efc.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/e393a11f-337e-4364-9cb9-733479884082/zedezesagekawin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33febb11-56a6-4076-824e-c38b8a6d9644/kewejevemigeribifuroxodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd046475-c786-46ea-92bf-99b897fcdce8/soft_skills_the_software_developer27s_life_manual_epub.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/unblocked_games_dirt_bike.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/unblocked_riddle_school_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5d6af7d-dcf0-4f46-943f-f91b93d2464b/23764230665.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_off0000c827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC827 5028 bytes
SHA-256: c0477d1e1b4954405455b400ba049b7d393c957744e93095b677114932cd6062
font_01_sfnt_off0000d92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92C 11248 bytes
SHA-256: 27f6e0dd220578d78c17ebbf523c5b9077b22a8702bb489eed30e2e4779b5a82

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