Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a559032bb9d96ea…

MALICIOUS

PDF

102.6 KB Created: 2021-03-20 10:21:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 444f11b2cde0e6fa92048a272a62f6e5 SHA-1: 35669c51e8a7f057fc9f5eb0cb096cf86b9074c5 SHA-256: 3a559032bb9d96ea94b22f1fe280858d55ebf4a62ca0d7131fe37014d2b1661d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution scheme. The embedded URLs and the heuristic firings suggest the document is used to drive traffic to these external resources, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/wix?keyword=go+math+grade+2+chapter+8+review+test+answers
    • http://epaytds.xyz/66429504076jjq00.pdf
    • http://itanto.space/78236900639j6xgx.pdf
    • https://lijipowurop.weebly.com/uploads/1/3/4/3/134314174/564b56237c6.pdf
    • http://levotavo.scienceontheweb.net/black_boy_book.pdf
    • https://fonomekaleguv.weebly.com/uploads/1/3/5/3/135308628/1711026.pdf
    • http://totalcreditreport.info/how_to_clear_xfinity_motion_sensorvrjxm.pdf
    • https://kamapapidez.weebly.com/uploads/1/3/5/9/135962567/9958079.pdf
    • http://physcoo.com/english_worksheet_possessive_adjectives595d0.pdf
    • http://waparudadip.mywebcommunity.org/categorias_gramaticales_2_eso.pdf
    • http://idealica-co.site/ride_the_tiger_expression_meaningt0unb.pdf
    • http://xewodatesuporob.mypressonline.com/30355097114.pdf
    • https://renesixedobalew.weebly.com/uploads/1/3/0/9/130969137/mufamoxatisufojop.pdf
    • https://ruwijupoxotafan.weebly.com/uploads/1/3/0/8/130814308/teripisegonujudorele.pdf
    • http://pumba.fun/xufibodakoxv125.pdf
    • http://e-sparks.ru/wapusubosuwoxufuzod0v839.pdf
    • https://reravojune.weebly.com/uploads/1/3/1/4/131406269/vuwikejezupak.pdf
    • https://tusujowifavenag.weebly.com/uploads/1/3/1/4/131453847/8990952.pdf
    • https://pejegenipejixe.weebly.com/uploads/1/3/4/8/134848799/guladivivir-savafu-porivifezasewo-ligemes.pdf
    • http://jorowijedo.mywebcommunity.org/muliweberasuru.pdf
    • http://sethel.xyz/nidon9gcns.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/59c4ac2d-19d3-4f5a-ad95-aca29a2a40e8/70200321089.pdf
    • https://uploads.strikinglycdn.com/files/8ace15c5-92be-4a15-be6b-f813f74171ea/don_juan_mexican_grill_bethlehem_pa.pdf
    • https://uploads.strikinglycdn.com/files/ba3c4249-1941-4c03-b74a-e6329d3590c4/epson_perfection_v370_film_holder.pdf
    • https://uploads.strikinglycdn.com/files/07f66811-1633-468f-b334-b037b9b20ee5/5489805296.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000152bd.bin
065f08348958b1b86c0a4a1e252ecbcdc2b3113596172fcb8b4f3906cf64e515		 pdf-font-stream PDF embedded font (sfnt) at offset 0x152BD 5964 bytes
font_01_sfnt_off000166ef.bin
f7595cda84cd5d44ddb72683f4991ec4ab1500062ba557c9a2c4b53ad8d8daad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x166EF 11072 bytes

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