Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db57ee5e1d89219…

MALICIOUS

PDF

85.2 KB Created: 2021-04-05 07:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d64b4c663fbedf4cfef23fecd91112e6 SHA-1: 249e47e26f8c7188ef678e508bb5bba757fe69a2 SHA-256: 9db57ee5e1d8921996d63f820c1118470ffcad147f6f306e5e1a20a53bf98a26
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/123?utm_term=autodesk+revit+2017%2528+r1+mep+fundamentals+pdf PDF link annotation
    • https://nabisafuv.weebly.com/uploads/1/3/1/4/131413222/zikuvasod_beleremuwamun_kidunomejak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428335/normal_60083f972ccbe.pdfIn PDF document text
    • http://creamspait.xyz/phpstorm_reformat_code_foldercy56m.pdfIn PDF document text
    • http://libralab.digital/jiwasapifusadafabovehv4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420459/normal_5fd97197a2988.pdfIn PDF document text
    • https://dolujutizividev.weebly.com/uploads/1/3/4/8/134864897/1628784.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483075/normal_60286bbcbcfca.pdfIn PDF document text
    • http://ductsunlimitedins.com/tri_fold_obituary_template_free307zt.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/f3314667-98d5-4e31-82bb-5f3582bc959a/muvixesaxipozezadek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aac615bf-6014-422b-be3a-7b2da0010bdd/45222517005.pdfIn PDF document text
    • http://fukasutatota.rf.gd/how_to_change_wahl_trimmer_heads.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39f051e0-cfe1-4e37-ba17-a54437f2712a/gofudoki.pdfIn PDF document text
    • http://sivisalatifaba.rf.gd/2010_lexus_rx_350_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/992dd141-c0ff-40f2-a327-6dc4394399ee/48478746438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a48ca053-2a73-4702-a023-74b5624d86f7/pazatej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d28635d2-151b-4641-9b6e-450aeb9261d0/88392650460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a501db0-869f-4229-a981-dd94bfeda66a/celeste_ng_books_read_online.pdfIn PDF document text
    • http://sidumudopok.rf.gd/46763472776.pdfIn PDF document text
    • http://figapow.epizy.com/94589917351.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_off00010dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD2 5784 bytes
SHA-256: 5da2ee8d3249166c97a4eb20bf1d54bb039f0ca4d4d71b484ff11d52f8083b23
font_01_sfnt_off00012188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12188 11040 bytes
SHA-256: ab280d7748793b7fd3df9bc08e563e55bc477ca77bd96d8041e8577350c1d2d3

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