Malicious PDF — malware analysis report

Static analysis result for SHA-256 12277c551432bb05…

MALICIOUS

PDF

79.5 KB Created: 2021-03-27 18:34:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: dd037a8ccdc4499003f29cef19e41343 SHA-1: d86c22b21617f336f2e0c6668ad6a17fa7298d52 SHA-256: 12277c551432bb058a6534927716e702cd9e4ca3d1a51456cbeeafdb22b419f7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one, https://midufefew.ru/award?keyword=brand+identity+meaning+pdf, being flagged as suspicious and likely used to redirect the user to a malicious site. The PDF structure and embedded links suggest a phishing or malware distribution attempt.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/award?keyword=brand+identity+meaning+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413363/normal_5ff57b1e1f3b8.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/gc9gehj/20381154745.pdfIn PDF document text
    • https://zopiwaseka.weebly.com/uploads/1/3/0/9/130969839/wopiregabogij.pdfIn PDF document text
    • http://lasomupigo.iblogger.org/improve_your_english_vocabulary_darejan_gurasashvili.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366389/normal_5ff65cd552f27.pdfIn PDF document text
    • https://cdn.sqhk.co/gowamojon/ighadt3/nozuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465914/normal_605173b6f31fb.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/gcU8hg5/kisuxiva.pdfIn PDF document text
    • https://cdn.sqhk.co/vemudumuxixu/xighgua/greenleaf_season_4_recap.pdfIn PDF document text
    • https://xubivolimoba.weebly.com/uploads/1/3/0/7/130740090/fa0fc6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wigegamumuxan.rf.gd/24640962698.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/79561402390.pdfIn PDF document text
    • http://zusapogadakafa.rf.gd/1908000688.pdfIn PDF document text
    • http://vanofasara.epizy.com/78987982126.pdfIn PDF document text
    • http://mivogunav.rf.gd/nizujedenimibixududa.pdfIn PDF document text
    • http://fomonew.rf.gd/71828196159.pdfIn PDF document text
    • http://potolonufe.epizy.com/kaukulan_ng_panghalip_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/gozof.pdfIn PDF document text
    • http://vejawogi.rf.gd/what_is_a_psychological_evaluation_for_police.pdfIn PDF document text
    • http://wigazimo.epizy.com/annotated_bibliography_format_on_word.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_off0000fab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB9 5304 bytes
SHA-256: d46fad924e28005881258d51ce3d32f2dd6a7e4862b60ffe51165fe8d65b34f4
font_01_sfnt_off00010cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC2 10584 bytes
SHA-256: 8a0d6683c768b970323cd5022f3341628ab19d9cbe345345444e68254cd27ae7

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