Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a92b04cb690ccbd…

MALICIOUS

PDF

75.4 KB Created: 2021-02-10 00:28:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 10c9e36d848ce8338e425df6fbd67601 SHA-1: 4416bcf39d0444420ae2e370fadc6f3cb10c3117 SHA-256: 1a92b04cb690ccbdb83dff1b9585c410ac03c05b90ade9b5e0d9492a0664dd79
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or a mechanism to distribute malicious content. ClamAV detection and ML classification further confirm the malicious nature of the file, identifying it as a phishing trojan.

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 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.
  • 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://jottigo.ru/aws?utm_term=personal+development+review+questions+and+answers PDF link annotation
    • https://fojaxekixuwid.weebly.com/uploads/1/3/4/7/134743661/pawibibate_jitovis_xilelogim.pdfIn PDF document text
    • https://fixupikavejezop.weebly.com/uploads/1/3/4/3/134392539/049530a1e6d.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/OhbqKkX/89614237631.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/IAjaqgf/28501922513.pdfIn PDF document text
    • https://cdn.sqhk.co/dujuxafetot/6WiRgdX/critical_care_doctor_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/yjhgjCY/pakisewilizavukufagubi.pdfIn PDF document text
    • https://gisonegeviwobi.weebly.com/uploads/1/3/1/3/131383673/tifoxijupawefu_wudopegaganevu.pdfIn PDF document text
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/1559739.pdfIn PDF document text
    • https://cdn.sqhk.co/katutilit/iGggIhi/xivubofewerete.pdfIn PDF document text
    • https://cdn.sqhk.co/govazilose/T5uUggS/2669817191.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/NhjAxjc/best_laptops_right_now_2019.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/kefefetafij/vollmacht_bedarf_nicht_der_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/in_between_the_sheets_ian_mcewan.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/grenfell_tower_report_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/excel_arrondir_dans_une_formule.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/autodesk_dwf_viewer_2018.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_off0000dc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8B 5264 bytes
SHA-256: c11cbae8128a128e442d61609f84f0c030665c94f39967ee4be2793d036ded53
font_01_sfnt_off0000ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 10368 bytes
SHA-256: 286a194b608cca35f5f5e815205bceb040243ea692781144c4083cd7f54d5673
font_02_sfnt_off000111d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D6 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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