Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae83936ced3627d5…

MALICIOUS

PDF

76.6 KB Created: 2021-02-18 00:37:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 38475c18fc391ab8b49ba97d2350fb7a SHA-1: 017c968f4271dd6252022bb751dcbfb9222f1509 SHA-256: ae83936ced3627d5731ebcb8df8e7742b05581c96fb4e0b552e3184fdfda1c89
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/wix?keyword=spanish+present+tense+quiz'. This indicates the document is designed to redirect users to a potentially malicious website. The ML classifier and ClamAV also flagged this PDF as malicious, supporting its malicious intent. No scripts were extracted, but the presence of a malicious URL is sufficient evidence of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=spanish+present+tense+quiz In PDF document text
    • http://artdebug.site/android_games_mod_forumd6r3a.pdfIn PDF document text
    • http://bilkan.fun/emergency_room_technician_requirementsoeey2.pdfIn PDF document text
    • http://fruitnaturs.space/gbf_crashing_waves_rising_beats_guidegigh7.pdfIn PDF document text
    • http://design-kvartira.info/nba_2k15_apk_hackq19f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368972/normal_5fcd54e1045ff.pdfIn PDF document text
    • http://rollernefrit.xyz/48870502614w8b30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485711/normal_5fee63fa9297d.pdfIn PDF document text
    • http://aazzzry.space/mukebijowoturi5gs2p.pdfIn PDF document text
    • http://apelsins.space/vomumud8z0bn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wolawatin/35912631927.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/topagalalikupavetixilutow.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/poxajawovuti.pdfIn PDF document text
    • http://kosuvoz.epizy.com/volleyball_games_videos.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/71086479039.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/50998698448.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/zojen.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/jerobusa.pdfIn PDF document text
    • http://podekorutad.rf.gd/fleecy_dryer_sheets_ingredients.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/blackheart_haven_veteran_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/music_notes_wallpaper_s.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CD 4924 bytes
SHA-256: ef3d4524f736041107569aea5bca27949345f627e9b3fd8b086270d1fbfd7676
font_01_sfnt_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 10320 bytes
SHA-256: c381442c3ec2be74797f6f946e52d023008e6bfaca1664c5e44ec4b937743c7b
font_02_sfnt_off000116e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E2 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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