Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd0a87b784d56658…

MALICIOUS

PDF

68.5 KB Created: 2020-11-11 05:59:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4b1b047c3aae9524a008e8500feab344 SHA-1: 2b6e2b4de66e658e583f37c42b1c0c7fbcfab464 SHA-256: dd0a87b784d56658794e36f578e0a8a539894b1ec6758952234500b09aa0d89d
262 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file exhibits malicious characteristics, including links to known redirector infrastructure and a high ML classifier score. The presence of a 'download button' lure and numerous external PDF links suggests an attempt to trick users into downloading files, likely leading to malware execution. The ClamAV detection further confirms its malicious nature, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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
  • 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://gettraff.ru/aws?keyword=apk+mania+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410000/normal_5f9346dc89fc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_5f94177d8df38.pdfIn PDF document text
    • https://wagofokixe.weebly.com/uploads/1/3/4/6/134694124/82f5b65dc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389353/normal_5faae757561dc.pdfIn PDF document text
    • https://xogofodaromaf.weebly.com/uploads/1/3/4/3/134387758/3113f2e2e82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378843/normal_5fa78aa80bcfa.pdfIn PDF document text
    • https://jinezosibe.weebly.com/uploads/1/3/4/4/134454760/ridun.pdfIn PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/boguxekoxudikani.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wanalovum/taas_test_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/outline_for_argumentative_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/all_awards_2019_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/label_the_digestive_system_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f6fe80c-6434-43c9-83b5-7295cd13104d/26516814764.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/kingoroot_new_apk.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_off0000cf8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8E 4976 bytes
SHA-256: 55d0c1c4b728c26a8bf2b49ccc605a2893c1caec1915627771be96d2cabb6eb3
font_01_sfnt_off0000e079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE079 10968 bytes
SHA-256: 73fd27e26e02066640b8cf2e58e8db71987beffe227778efb26b1557491c519a

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