Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae70c8faa345c9b5…

MALICIOUS

PDF

69.9 KB Created: 2020-12-15 00:53:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7345ccf195fe3ab4e0b093a8b305ca2c SHA-1: 174fdd3b4b5b47f0471b303a06cd4788d7f3393c SHA-256: ae70c8faa345c9b5cd8b14f8de5f77c32b464e708f00ab66320cd8cfb8dcd258
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to online content. The presence of multiple external PDF links, including one identified as a redirector, indicates an attempt to direct the user to malicious infrastructure, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://cctraff.ru/123?utm_term=how+to+do+exponents+in+word+online In PDF document text
    • https://static.s123-cdn-static.com/uploads/4502833/normal_5fc80115d466b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386848/normal_5fcd10146171d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414852/normal_5faf9d7c4c955.pdfIn PDF document text
    • https://lezovijun.weebly.com/uploads/1/3/4/8/134865909/welifabab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388614/normal_5fa7fac05f3f0.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/posufij/66333454096.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/81143045460.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5890b084698658e7db8b9/t/5fd01ab86cbf29106bf024c6/1607473849135/5128193026.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/aurangabad_news_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/where_to_send_innocent_spouse_relief_form.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/frosting_sheets_vs_icing_sheets.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_off0000d587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD587 4864 bytes
SHA-256: 54c328e05ed723802c141c65329542ac2b5600f9ac13c07b68c3677d2cb0c3c9
font_01_sfnt_off0000e634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE634 10888 bytes
SHA-256: 9ef3f37b29bc0e0470de1d77533dfb058450c1dd1171fe108136020c7f120c77

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