Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9a35883225c5bb…

MALICIOUS

PDF

81.0 KB Created: 2021-02-17 19:12:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 128ccd83cbaff30f1c98229cc6a22970 SHA-1: a6f164c5a79926c5af8f10321f48b95355957429 SHA-256: aa9a35883225c5bb037aa2d571a544b687eae21407d9b8ebc864b165c919ca3d
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with several pointing to known malicious redirectors and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam campaigns. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=champion%203500%20watt%20inverter%20generator%20vs%20honda In PDF document text
    • https://solugelefeko.weebly.com/uploads/1/3/0/7/130740562/9897439.pdfIn PDF document text
    • https://dunomomavelow.weebly.com/uploads/1/3/1/4/131407267/nisunokano-sufokuxiwef-nupeb-girodin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390680/normal_5fef844e6d498.pdfIn PDF document text
    • https://gazikurow.weebly.com/uploads/1/3/1/4/131452893/medunatipejapu_litipajumozokav_lomusipir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495050/normal_5fc93b52bc693.pdfIn PDF document text
    • https://pazomanu.weebly.com/uploads/1/3/1/0/131069777/c94121cbae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421218/normal_5fd19d026699e.pdfIn PDF document text
    • http://wewedaz.iblogger.org/casa_aerodrome_reporting_officer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369502/normal_602aef9ae6f68.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/bizadozasene.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/p-_calendar_angular_2_date_format.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/meboturapewi.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/11481975261.pdfIn PDF document text
    • http://jipowefata.epizy.com/bspp_thread_size_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/51074917424.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/35055417267.pdfIn PDF document text
    • http://fotopokidag.epizy.com/capacitive_moisture_sensor_v1._2_datasheet.pdfIn PDF document text
    • http://gaditerigasut.rf.gd/rascals_songs_ming.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 5732 bytes
SHA-256: a892702b7ce8824454e78fb4fb5a61397712d672064588e52ee00b7ee6b76a8a
font_01_sfnt_off00010486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10486 10556 bytes
SHA-256: e32a1c37a02de3d3c33d730dea3c7507424ef89a9b2ed7c2bd2959f2dbd00926
font_02_sfnt_off00012858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12858 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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