Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86029b234e2c36c…

MALICIOUS

PDF

67.0 KB Created: 2020-11-24 02:30:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8c0bc16798b69b04fd57e8f397b451e1 SHA-1: c4957babc9030350cf25becb8a6721eb1becc73e SHA-256: f86029b234e2c36c459b294c6e4b9ce3380d4921b151cac495a94a61eecc8ca0
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded links likely serve to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffmen.ru/strik?utm_term=development+through+the+lifespan In PDF document text
    • https://povijovo.weebly.com/uploads/1/3/4/4/134463476/zosuma.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/bizipedozi.pdfIn PDF document text
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/sixatuzatena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369190/normal_5fbc3f9d7a2cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369163/normal_5f88c0dbec948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459796/normal_5fa29535cefd7.pdfIn PDF document text
    • https://vezerovir.weebly.com/uploads/1/3/4/5/134580053/sarijupilijesob.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/f8f73ef9-8fed-4fcf-beb6-62e39ee5bae2/proteus_8_french_language_pack.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/the_best_antivirus_software_application_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/my_lead_gen_secret_coaching.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/42253030997.pdfIn PDF document text
    • https://s3.amazonaws.com/suzitivasekoga/90292436408.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_off0000caa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA8 5376 bytes
SHA-256: 897a46a3215ddb333b429edf57bb8b149a82024e937c85b9e6e100862c02f644
font_01_sfnt_off0000dcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD8 10344 bytes
SHA-256: 6b0e079fa0befe5a460ab10a2c62c5e7aa27deaf43220f7092e75ce0bcda9967

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