Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1e63f7d9c8da4d…

MALICIOUS

PDF

73.1 KB Created: 2021-01-18 04:59:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 8ddb1ff61e02d96ecd7d85707d92b739 SHA-1: 7f45b6be7c17395651cae9d43a04dd286b516b4f SHA-256: 5a1e63f7d9c8da4d1633f8236aaaf117c73a2ce73316571ac95907435d3fcbd1
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with critical heuristics indicating it functions as a redirector and a link farm. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier score of 0.999771 strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to 'pre writing skills by age' and 'wkhtmltopdf', which appears to be a lure to disguise the malicious links.

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://cctraff.ru/123?utm_term=pre+writing+skills+by+age In PDF document text
    • https://ninuxegomozul.weebly.com/uploads/1/3/1/8/131871835/lewasup.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/hogejcn/yes_we_coupon_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/hiiC0AF/aesthetic_wallpapers_yellow_and_orange.pdfIn PDF document text
    • https://kidepexabosu.weebly.com/uploads/1/3/4/2/134266059/8680725.pdfIn PDF document text
    • https://siwizapetodid.weebly.com/uploads/1/3/4/0/134041585/kudes.pdfIn PDF document text
    • https://surudebed.weebly.com/uploads/1/3/4/5/134513173/8300874d.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/mijedusovineti/92852221683.pdfIn PDF document text
    • http://lokokojorivumi.rf.gd/betrayal_cheat_sheet_poe.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/calendar_templates_free_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/towuzaxogikikarowale.pdfIn PDF document text
    • http://puguvapalovuzub.rf.gd/bafg_hamburg_formblatt_3.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/informante_newspaper_editor.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/information_about_oasification.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/43232448647.pdfIn PDF document text
    • http://vukenorap.epizy.com/87850021880.pdfIn PDF document text
    • http://nabesazuxipuf.epizy.com/washington_post_crossword_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/makaviwugifexazesojorevu.pdfIn PDF document text
    • http://detuzojezil.rf.gd/software_hao123_indonesia.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_off0000df22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF22 5252 bytes
SHA-256: 96bf48de3464567ef03606eaf71e4493d53815ac218b152ab7818636ce6bc9ef
font_01_sfnt_off0000f12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 10880 bytes
SHA-256: 6b3750f42aa9650e1d31e73ff9d477af92f06aa502a917d84799332b0883e398

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