Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f358ad9e471edd…

MALICIOUS

PDF

69.6 KB Created: 2021-04-08 08:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4be6fbb6e31ed7ab6c56ab74a0bd33b4 SHA-1: afd6b04c84467bc9f53317556ccaf1d45b020a9d SHA-256: 85f358ad9e471edd325fbc363808d162d5d08df344fac0c6e2bb37c07217f279
154 Risk Score

Malware Insights

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

The file is a PDF containing a large number of external links, many of which are to benign-looking documents but one points to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7003

Heuristics 4

  • 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.
  • 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
  • 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://resalured.ru/strik?utm_term=do+androids+dream+of+electric+sheep+omnibus+pdf
    • https://cdn.sqhk.co/dedikunakudu/fgggi0C/71890818161.pdf
    • https://cdn.sqhk.co/miloxuso/ejcTig8/jepuxotidizisusogug.pdf
    • https://cdn.sqhk.co/gitovera/fvvPihZ/ikea_dresser_recall_list.pdf
    • https://cdn-cms.f-static.net/uploads/4425511/normal_602d43a5c8ea5.pdf
    • https://cdn.sqhk.co/dodiniwotud/7Kicupt/tasibazibilurororobez.pdf
    • https://cdn.sqhk.co/wofazexej/hj4Ojjh/ribovufirure.pdf
    • https://cdn.sqhk.co/nokotadi/bDDmfgi/38207236205.pdf
    • https://cdn-cms.f-static.net/uploads/4366980/normal_6045c69b065af.pdf
    • https://static.s123-cdn-static.com/uploads/4470207/normal_5fc6cf6f4901c.pdf
    • https://cdn.sqhk.co/liregagibago/8Aybajg/5098658808.pdf
    • https://cdn.sqhk.co/wibetaxor/ohclUjd/kathy_rain_walkthrough.pdf
    • https://cdn-cms.f-static.net/uploads/4424040/normal_5fd78893c3fab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/getizar/are_ninja_blender_bases_interchangeable.pdf
    • https://uploads.strikinglycdn.com/files/d3d3018b-122d-4723-945c-c7af63eed2ae/7129595624.pdf
    • https://s3.amazonaws.com/jivala/toxicology_report_cost.pdf
    • https://uploads.strikinglycdn.com/files/727a96e5-0586-474b-8c7e-3e3b4070485c/67155554544.pdf
    • https://uploads.strikinglycdn.com/files/a813b23a-b39f-4005-a02b-ec092878bd15/what_is_the_meaning_financial_loss.pdf
    • https://s3.amazonaws.com/pusixa/wrong_turn_7_trailer.pdf
    • https://s3.amazonaws.com/xefejevife/accurate_heart_rate_monitor_apk.pdf
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_b897c81aca154428b0a63b6c69f9c6bf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/98ce0b8a-43cd-4101-a833-a9a54f5ec3f8/76896389835.pdf
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_3d9349dd291c48e59f4295a94b6f63fb.pdf?index=true
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_2d6f46e2b6124c48b95862f290cb80ec.pdf?index=true
    • https://uploads.strikinglycdn.com/files/334213ea-a5db-4dbc-8ecd-a18432b0ff7c/16246637062.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f66e.bin
d78554d9b5eb74d8b37d5b9266e551e2e67c261a1c71911738a4783e7b976641
pdf-font-stream PDF embedded font (sfnt) at offset 0xF66E 5532 bytes