Malicious PDF — malware analysis report

Static analysis result for SHA-256 b985bec489196f6f…

MALICIOUS

PDF

78.3 KB Created: 2021-04-05 07:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b51e1c42c301f70efbc2eae23f81aab7 SHA-1: ead3803e8ac3c625369f1ac0403611ed468d3016 SHA-256: b985bec489196f6ff89c5da35290585165fde17f50414170e77ef69c20b3d567
154 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier and ClamAV also flagged this file as malicious. The document body, though heavily obfuscated, contains text related to 'Us attorney's office dc special proceedings', suggesting a pretext for a phishing or malware delivery attempt. The primary malicious URL identified is https://dafemum.ru/strik.

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://dafemum.ru/strik?utm_term=us+attorney%2527s+office+dc+special+proceedings In PDF document text
    • https://cdn.sqhk.co/zewezerezi/eggp5if/hawthorn_bank_mo_routing_number.pdfIn PDF document text
    • https://cdn.sqhk.co/meduxemij/DHShcPC/brutal_age_horde_invasion_hack_apk_download.pdfIn PDF document text
    • http://nibakelenixezas.getenjoyment.net/1984_penguin_readers_level_4.pdfIn PDF document text
    • https://cdn.sqhk.co/potasuregoz/ihbGggd/omg_remix_kitty_k_fashion_doll.pdfIn PDF document text
    • http://kexawez.mygamesonline.org/biosynthesis_of_flavonoids.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/jhcjeQv/fitazazufoxewizejefigupa.pdfIn PDF document text
    • https://cdn.sqhk.co/pinepopowig/adiiche/free_country_music_ringtones_download.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/vavabi/11554853878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a9bee6f-7e19-4ccc-9f4a-5ed861d25c97/sugadedimoxejakoniri.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/raju_bhai_whatsapp_status.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/aaliyah_try_again_song.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/94054915455.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/prague_airport_transfers_get_your_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ab57d9b-62ef-4ec3-9dcb-fb0f35b9a924/how_to_tell_if_its_dipole_dipole.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/commercial_walk_in_cooler_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/banunawigafedagoxifuwo.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/monopoly_deal_rules_wild_card.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_off0000f46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 5448 bytes
SHA-256: ceebe856bed8d7d1ea8f9e28d7a18d668b935b7c0ef394e966a90745ad3216c0
font_01_sfnt_off00010719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10719 10740 bytes
SHA-256: f7b5d366fb3d56c72d0a92e7cf03bdfdabc0b0db6b1cbf790766b6dfaf9e1ed2

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