Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b2c5c46e1e884a…

MALICIOUS

PDF

73.8 KB Created: 2021-02-18 00:17:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ceba4d943ac43854a788070cbedde114 SHA-1: e3555cbc820159af8de6f30e2c57972c295fdfd1 SHA-256: d7b2c5c46e1e884abc37d36bd77469aa8d2d61fc70d0f31a4b2d9a1512cc5fc6
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 critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/123?utm_term=latin+maxims+contract+law'. This indicates an attempt to lure the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient evidence for this assessment.

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
  • 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://yafferge.ru/123?utm_term=latin+maxims+contract+law In PDF document text
    • https://cdn-cms.f-static.net/uploads/4488335/normal_6017fd39a8895.pdfIn PDF document text
    • http://it50save.info/bass_clef_ledger_lines_worksheet_answer_keypjpjv.pdfIn PDF document text
    • http://ruwakus.22web.org/86795933314.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/ijib7jb/launcher_ios_14_premium_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/jcXhjhh/history_of_christmas_traditions_around_the_world.pdfIn PDF document text
    • http://termometr-medikal.site/95454469982idtw1.pdfIn PDF document text
    • https://cdn.sqhk.co/senosekagoko/f0bgj6T/iihf_juniors_2020_live_stream.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/jupudizadid/assamese_movie_kanchenjunga_song.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/free_business_plan_template_microsoft_word.pdfIn PDF document text
    • http://batuzotunar.rf.gd/esophageal_cancer_european_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/vujidaroso.pdfIn PDF document text
    • http://jujabezemaluwe.rf.gd/22313495674.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/assamese_video_song_spicy.pdfIn PDF document text
    • http://tonixororonimi.rf.gd/why_does_my_ninja_coffee_maker_not_work.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/69057061826.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_off0000e6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C3 5048 bytes
SHA-256: 3528994f27a02daad8e1c4f605257b89d54235f1c5a57a48ce92612c3e800bc7
font_01_sfnt_off0000f7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F0 10228 bytes
SHA-256: 2282e453d70abba8411a06b5147377494d4ac3aa9f95f1edaff38c52bce6d2ed

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