Malicious PDF — malware analysis report

Static analysis result for SHA-256 1255dc931249d87a…

MALICIOUS

PDF

74.0 KB Created: 2021-03-21 04:13:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8de3ce5522b1eac01afc7cdb8ce47f8d SHA-1: d99551df2fe8049e37457eae022b3f88aa6b68f1 SHA-256: 1255dc931249d87acfcd8590efeaf5270bb210ef8c1aecf65a189dc2a0df02dd
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains multiple embedded URLs, with one specifically identified as an external URI pointing to a suspicious domain, likely intended for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/123?utm_term=present+perfect+activities+worksheets PDF link annotation
    • https://cdn.sqhk.co/moromasi/gficfi6/skull_live_wallpapers_for_iphone_xs_max.pdfIn PDF document text
    • http://ipatovaalena.ru/45083597771xs47h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403680/normal_6025640fd82e0.pdfIn PDF document text
    • https://cdn.sqhk.co/giravopakiw/dLkSjaI/zuvoxuvajemufoluwakegube.pdfIn PDF document text
    • http://goodxday.xyz/geometric_shapes_worksheets_for_4th_grade734mn.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/ggja1Qe/gesejide.pdfIn PDF document text
    • https://cdn.sqhk.co/komagiju/aaheggd/viwuxezeki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444100/normal_60538a80bef5b.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxaroposa/pihejjm/60831923627.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/OK1yiaz/hero_xpulse_200t_max_speed.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/3rgfuha/disney_sorcerer_s_arena_best_team.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393022/normal_604fe523c1767.pdfIn PDF document text
    • http://hisgohar.site/nojusijowile6mmbj.pdfIn PDF document text
    • https://cdn.sqhk.co/jilelemo/dMgjhij/nail_art_and_spa_saint_petersburg.pdfIn PDF document text
    • https://cdn.sqhk.co/gukomoluda/jfhajdu/lajosiwa.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/fevobelijogal/what_are_some_examples_of_the_purposes_of_patient_care_services.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/complete_subject_and_predicate_worksheets_3rd_grade.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_off0000e4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 5288 bytes
SHA-256: 16c42a1f578feebf9f96c6d65d43ab310f625908d8c31b7e1baad08899ac9258
font_01_sfnt_off0000f6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 10484 bytes
SHA-256: bab8046c65132557018467a91342cbf16ec1241034abcdb217861a21a9da87e1

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