Malicious PDF — malware analysis report

Static analysis result for SHA-256 31dd4fbe705ccac8…

MALICIOUS

PDF

83.7 KB Created: 2021-02-23 08:12:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0f655f96047337909b39865f3c401108 SHA-1: 2cf618ce05f5d6dd478c73eb54a45341131fc3b1 SHA-256: 31dd4fbe705ccac8749bcb968edd9112e0d61ef4aab2f0f32bda4774a7dffc25
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/strik?utm_term=porque+se+produce+el+insomnio+en+adultos PDF link annotation
    • https://lejumapufa.weebly.com/uploads/1/3/4/6/134688193/5f01b27c0.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/haLbWha/radio_kiss_fm_online_live_romania.pdfIn PDF document text
    • https://wojewifonutej.weebly.com/uploads/1/3/4/8/134883442/kufugebololimitekena.pdfIn PDF document text
    • https://voliguxuzewiwa.weebly.com/uploads/1/3/4/7/134762967/kosakodoz.pdfIn PDF document text
    • https://cdn.sqhk.co/furigelo/dj2Hhjh/78107935287.pdfIn PDF document text
    • https://cdn.sqhk.co/tazakabebilo/WYhd7Y0/advanced_negotiation_skills_training_singapore.pdfIn PDF document text
    • https://pigulanofalo.weebly.com/uploads/1/3/1/4/131406379/30289aa92.pdfIn PDF document text
    • https://xaxazusilu.weebly.com/uploads/1/3/4/7/134757455/terogexevew.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/gj9uibf/janilirerunuzuferosuzu.pdfIn PDF document text
    • https://vokugovu.weebly.com/uploads/1/3/4/5/134598923/xusizemowoworo_wesozaroju_legurivezaju_pularusazo.pdfIn PDF document text
    • http://fitnesspack.net/4805117388p1745.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/Hhg1aid/geometry_wars_galaxies_wii_rom.pdfIn PDF document text
    • https://cdn.sqhk.co/moxoxitij/hDCFRuZ/nrg_player_music_player_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/fhejajh/39977131207.pdfIn PDF document text
    • https://tabuwesajusa.weebly.com/uploads/1/3/1/8/131856124/6954217.pdfIn PDF document text
    • https://wowujisalot.weebly.com/uploads/1/3/4/3/134349860/nusile_xowofixutad_fasotixerasu.pdfIn PDF document text
    • https://cdn.sqhk.co/pizokifuxe/jeigExF/95816940732.pdfIn PDF document text
    • https://cdn.sqhk.co/lexoxuxoluvi/bhbPgjP/block_tank_wars_2_premium_apk.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/sigobija/aacr2_cataloguing_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/nice_guidelines_preeclampsia.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_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 5228 bytes
SHA-256: 4ef9ef704b118bd8e359c3519a23fe30b4346a15c478d3be1d8cc38cd83b377e
font_01_sfnt_off00010cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC0 11248 bytes
SHA-256: ee3d50bac92577f925f6e41bfd6865f63488bd9a8836986683e7aeab62da30fa
font_02_sfnt_off0001314c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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