Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a218abbe19e7f90…

MALICIOUS

PDF

86.5 KB Created: 2021-03-06 14:46:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 3bd9013d1ae6b3e642ad3778c6b22399 SHA-1: 8615e422144594695dc1558c156f20a44934045d SHA-256: 4a218abbe19e7f9096b15a7e2f7e8012194ae928e3fdceb3ea908e8c3723c5b9
194 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded links, one of which points to known malicious redirector infrastructure and another to a suspicious domain, suggesting a phishing or malware distribution lure. No scripts were extracted, but the presence of malicious links is sufficient evidence for the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/strik?utm_term=how+to+watch+chuunibyou+demo+koi+ga+shitai In PDF document text
    • http://centerverifybadge.com/download_drake_pop_style_mp3ehhaj.pdfIn PDF document text
    • https://cdn.sqhk.co/zunesunatiri/dNPhtgf/45660279326.pdfIn PDF document text
    • https://cdn.sqhk.co/gabironero/hi2JGbK/77561367687.pdfIn PDF document text
    • https://cdn.sqhk.co/fojevimexu/iiUCmAP/mutabuparutigusarapebuz.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/3jdhaDc/download_game_alien_shooter_lost_city_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/xRjelLI/koa_near_me_now.pdfIn PDF document text
    • https://cdn.sqhk.co/nerenina/2b6Q2hd/sejososujegotidogetoroguj.pdfIn PDF document text
    • https://cdn.sqhk.co/jujadiziga/cthhbvM/nizibatiri.pdfIn PDF document text
    • https://cdn.sqhk.co/mamidusidozu/6y4jhii/81986330796.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvapolaxaj/s0xPhb2/besudezikesido.pdfIn PDF document text
    • http://fruct.space/kidde_smoke_alarm_i12060a_manualtvm6x.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/jahfqih/smash_ball_hit.pdfIn PDF document text
    • https://cdn.sqhk.co/sejujona/jiIagdB/mermaid_baby_pics.pdfIn PDF document text
    • https://cdn.sqhk.co/goxufime/geYm1Qf/nogazepulepisixog.pdfIn PDF document text
    • http://apeech.ru/brown_kraft_paper_sheets_wholesalebt8p7.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/KgdB8Ih/skater_skirt_white_top.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/89972510868ggxtr.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
    • 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE808 5468 bytes
SHA-256: 32ba105fec79fcf161be84af7a4becdf89756a134a38384d26714d44cf024cb3
font_01_sfnt_off0000fa7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7E 1912 bytes
SHA-256: 10b43ecc1c080f527ac22fdad5379ea777f1378f0a8be64d5544c0624bd7b04b
font_02_sfnt_off000103bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BF 10808 bytes
SHA-256: 61bc75d4aebf5aa09123bdf63a449c1f4186c67d89439851ab4852619a635343
font_03_sfnt_off0001291d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291D 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2
font_04_sfnt_off00013de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE4 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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