Malicious PDF — malware analysis report

Static analysis result for SHA-256 da444abbc0c975ea…

MALICIOUS

PDF

62.0 KB Created: 2021-06-13 06:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0228369399b2cfbf729022cf406d6dfb SHA-1: 9b3020aa7e775231a0771bac199032831ea88b0f SHA-256: da444abbc0c975ea695e46fa870139d25999dfcb81323f0f55f92d0ddec2d7e9
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 0.8531

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://irlanc.ru/pbw?utm_term=mathematical+statistics+jun+shao+pdf PDF link annotation
    • https://galojegada.weebly.com/uploads/1/3/4/3/134364802/7711683.pdfIn PDF document text
    • https://pibekexamu.weebly.com/uploads/1/3/4/4/134401786/72740d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372382/normal_605929916eb84.pdfIn PDF document text
    • https://zanelonovubut.weebly.com/uploads/1/3/4/3/134315015/7965023.pdfIn PDF document text
    • https://jobawanajofuru.weebly.com/uploads/1/3/4/0/134042661/1965404.pdfIn PDF document text
    • https://supaxusomit.weebly.com/uploads/1/3/7/4/137499206/ede50354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414869/normal_6051588061015.pdfIn PDF document text
    • https://latitidazus.weebly.com/uploads/1/3/4/0/134018806/5269008.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403410/normal_5fe5e0b130889.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/004c3d9c-e97d-426d-890c-0124805aa6f9/homelite_360_chainsaw_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/666baffa-ca9b-4096-a109-bb146e52ae1f/xumabudodubeliwuko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1793b27a-808a-4c0b-be40-8e78b7d6e8d2/81445549352.pdfIn PDF document text
    • http://kigemulu.pbworks.com/w/file/fetch/144692556/human_physiology_silverthorn_7th_edition.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/gawomula.pdfIn PDF document text
    • http://kepigiwup.pbworks.com/f/chura_ke_dil_mera_remix_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4123c12-1c21-4330-9f37-d31c6db1919a/monopoly_rules_selling_houses.pdfIn PDF document text
    • http://pewudomame.pbworks.com/w/file/fetch/145031292/best_ad_free_qr_scanner_for_android.pdfIn 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_off0000be3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3B 5380 bytes
SHA-256: 7104dad9cce79ea41a8af933efd25b4019c3b1831266fa4854fd4413d5dac22a
font_01_sfnt_off0000d078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD078 10412 bytes
SHA-256: 331488b2cd009be0510092cace777c770e1b9664eec5bc71d762582307870d72

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