Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb7cf4855ac8e2c…

MALICIOUS

PDF

72.3 KB Created: 2021-03-24 22:52:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e2dd7f7e2367d258cee87646caaca6e7 SHA-1: 710f172e3da3921f2e99da6dfd20546f9558eaaf SHA-256: 2fb7cf4855ac8e2cd621ba7b1400a537de508feb48b156ef382bc4e37a027414
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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
  • 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://mezovuduw.ru/strik?utm_term=warrior+cats+upcoming+books+2020 PDF link annotation
    • http://checkmycredit.info/66980132422tzt52.pdfIn PDF document text
    • http://topvideo.design/mokenuzejezitamiruxokuvim7rylc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485929/normal_5fde0a621ea6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480748/normal_6039c5827717a.pdfIn PDF document text
    • https://wukajimodowel.weebly.com/uploads/1/3/0/8/130874313/7215990.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381737/normal_5ffb18efc7b53.pdfIn PDF document text
    • http://naykaryadom.fun/hello_kitty_emoticonsqqcfu.pdfIn PDF document text
    • http://devgame.design/how_to_calculate_dividends_paid_to_common_stockholdersawg9k.pdfIn PDF document text
    • http://mihetos.xyz/wobireta3482g.pdfIn PDF document text
    • https://govewusig.weebly.com/uploads/1/3/0/9/130969429/07ce5c570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446647/normal_60390c069df6f.pdfIn PDF document text
    • https://wiruwopifezub.weebly.com/uploads/1/3/4/3/134345133/vugonalaxarope_tiroluwepepaxu_gotatewu.pdfIn PDF document text
    • https://bolifalaloken.weebly.com/uploads/1/3/1/4/131438202/legajefanojekojas.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/38732883-56fe-4677-b6eb-1361fbde2b1a/free_live_candlestick_stock_charts.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/zugukirowenozepojasa.pdfIn PDF document text
    • http://xifimerin.onlinewebshop.net/mikujemeporukumevaxoze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04d19b30-1e22-438a-a6f5-a8f1af925033/speed_queen_washer_and_dryer_measurements.pdfIn PDF document text
    • http://lavisekenesavof.myartsonline.com/water_pollution_causes_effects_and_control_measures.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/bapuro.pdfIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/39515700962.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_off0000dc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC12 5712 bytes
SHA-256: 2c17638b474725c58c382ac1b47d5d18d65c0d24941f5e05d173efa2c54eb77b
font_01_sfnt_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 10648 bytes
SHA-256: ffd8574afd3fdd80833e640c6fd27ef25c67271784b82fccd3bf2176319e21b5

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