Malicious PDF — malware analysis report

Static analysis result for SHA-256 1880fb799d0d54fa…

MALICIOUS

PDF

70.0 KB Created: 2021-01-11 22:41:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a76dfff803d98d2a464f151e65cf7a7f SHA-1: afdd1d21cb6513d3edbaec9f41a604d72db3a48e SHA-256: 1880fb799d0d54fa7d3f733bf12935447f56c12544f9c577a88e520a5f35d7ee
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is designed to trick users into downloading malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to software downloads, supporting the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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/aws?utm_term=autodesk+sketchbook+pro+windows+10+free In PDF document text
    • https://wijimoki.weebly.com/uploads/1/3/4/4/134485243/d3b791014f.pdfIn PDF document text
    • https://cdn.sqhk.co/dusimefosix/fkkjfhg/gilulupegujuta.pdfIn PDF document text
    • https://cdn.sqhk.co/busoleva/ZiihjfJ/gesorusetewexor.pdfIn PDF document text
    • https://sobalapufutagum.weebly.com/uploads/1/3/4/6/134601001/2503871.pdfIn PDF document text
    • https://maladekokox.weebly.com/uploads/1/3/4/7/134745457/rapopafifireja.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/gh3Uje3/wordbrain_2_movies_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/ajaifif/jiweravosoge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409000/normal_5f946ade0a5d3.pdfIn PDF document text
    • https://guburumo.weebly.com/uploads/1/3/4/3/134322172/dajipevexobe_zubokuler.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/jezobasit/80671160895.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/walhalla_south_carolina_map.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/suspend_sc_insecticide_safe_for_pets.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/16031037928.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_off0000d385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD385 5480 bytes
SHA-256: 7b4f94f97c078842ea52102fc696f2754f3b9ba9c42de2e01b4bb7511b5c80d0
font_01_sfnt_off0000e63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63F 10796 bytes
SHA-256: b634c349e9f61bb7334058bf9da4631b024e1b3d6376a903061e13280eef9d21

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