Malicious PDF — malware analysis report

Static analysis result for SHA-256 516f266609852eef…

MALICIOUS

PDF

70.8 KB Created: 2021-03-16 22:03:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5e6df9cfc6bda5e1fdce5d722c153fdf SHA-1: 733d6b2b5633bfe9cbc2c8088e882888582264a9 SHA-256: 516f266609852eefee17d982fd8b24206dd69a38ab6c8c62da9683fd32cfce7f
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 0.9996

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
  • 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://jacksth.ru/123?utm_term=brookline+nh+police+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485807/normal_6038070a4447a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393754/normal_60309c617dc57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449397/normal_5fcfb057514bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472204/normal_5fc985b5a8808.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416790/normal_5fe4028c5e9b1.pdfIn PDF document text
    • http://mexawolin.medianewsonline.com/rugefugirudolavudofo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403954/normal_5ffa79b819e22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443357/normal_602fc6b797afd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366004/normal_5fc96d97e6b6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379240/normal_5fe15dc51fc2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486987/normal_5ff515f7aef01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409096/normal_601a01223c934.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445866/normal_601842cc9c702.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458614/normal_5ff1f3c83feca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_2847aa259ef64c2d9f459d007944f18a.pdf?index=trueIn PDF document text
    • http://saxodanokijaj.atwebpages.com/65038001754.pdfIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_a5fe7a7e1bef4bf4b4b59d29b3b66b88.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/214ac6dc-eeda-4afe-b3b6-c8b4054ebe70/halliday_fundamentals_of_physics_10e_slader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f115dd6-fed6-4e7c-af8a-c6602779aa79/sikegepazeka.pdfIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_c386214458144541b2c498c042fbf6cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5abe465c-672e-4143-a2fb-6ce6bd1b23d3/27225424151.pdfIn PDF document text
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_88f6617cf05944178862a3dd6d273b94.pdf?index=trueIn 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_off0000da79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA79 4748 bytes
SHA-256: 002d9b8cff3d67feda5d3205e75a91291ed0ec3657bbcae68052a478760e5375
font_01_sfnt_off0000ea9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 9896 bytes
SHA-256: 9ccb1e48e83d3d7b699ed007e6f8cb7f12d19ad5c39bff65a01c28625de58973

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