Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6060c3e55c5d54f…

MALICIOUS

PDF

70.9 KB Created: 2020-12-18 14:58:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8c2726ce32d32f94db0be0993e443724 SHA-1: 7bb7c7329786ce88702f9cca2c7576a6c9994619 SHA-256: f6060c3e55c5d54fc57fb0dc156882f9e393046bf0e1ec3ed611444cec659ba3
162 Risk Score

Malware Insights

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

The PDF file contains a link to known malicious redirector infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with a high probability of being malicious. The document body, though partially corrupted, suggests a lure related to an 'answer key', combined with a 'download button' heuristic, indicating a phishing or social engineering attempt to trick the user into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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?utm_term=answer+key+jee+mains+2019+12+january In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373505/normal_5f9eb08438b73.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/legipalofi/27533086700.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/78684328522.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/selected_skin_care_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/choices_stories_you_play_apk_hack.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/mibidubumotin.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fceb58cc2c1204b4fba77fe/t/5fd04ec148ae4d1218fdadd3/1607487169571/xodexejofuxexowarejoko.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/83699461139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36b8ac6e-76e1-42f9-b249-afd8c62b3d85/lowifaxobiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc4a3097-f9ec-427c-8ce0-35aa2ea5e102/xagara.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/eye_of_the_tiger_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/9863527193.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000c557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC557 6416 bytes
SHA-256: 9e91590ae502ff902ba306624a00c8d44396a7ee9717b1bfa1717db63fe08483
font_01_sfnt_off0000d52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52A 5604 bytes
SHA-256: 1d6b8f7082cac2ccab53739bbb2798e03abd9a801864fadaf14a3ab0514fe26b
font_02_sfnt_off0000e83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83A 10736 bytes
SHA-256: 93bbb7536fd6a63884112e842d46c1444a6456baca2ddbb6e2d3b42656a2262c

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