Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1fcd219c90de46…

MALICIOUS

PDF

80.1 KB Created: 2021-03-12 17:56:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0c9f5190f221e8c771bc03df6c6fdfbb SHA-1: 02833c6f6fa66c6eb548ce0c838fd483bfb041ac SHA-256: 3e1fcd219c90de4686a497a2eb9bf09a1c710c07af9c1251eaa2ea91dc814af9
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV both flagged this PDF as malicious, with ClamAV identifying it as a phishing trojan. The document body, though heavily obfuscated, contains text related to medical procedure codes, likely a lure. The presence of numerous embedded URLs, including one pointing to 'soxebez.ru', suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://soxebez.ru/strik?utm_term=what+is+the+procedure+code+for+diabetes+mellitus PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484356/normal_5feb45b4ef223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485001/normal_600d51fda6ecb.pdfIn PDF document text
    • https://cdn.sqhk.co/vozevadijut/ciabiev/streamlabs_donation_link_not_working.pdfIn PDF document text
    • http://kowuterada.mygamesonline.org/72718700241.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/jd2hghe/guide_for_among_us_walkthrough_episode_5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413982/normal_601b5f3801049.pdfIn PDF document text
    • https://cdn.sqhk.co/bidusowo/teddwjg/59281870602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485149/normal_60266afcac422.pdfIn PDF document text
    • https://cdn.sqhk.co/liwifetil/dyiggeL/wedding_cake_table_decorations_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/silijebutu/ih2s7ja/slackers_bar_fort_lauderdale.pdfIn PDF document text
    • http://bisibometixo.mywebcommunity.org/73038280934.pdfIn PDF document text
    • https://cdn.sqhk.co/pekobenew/eX9hihj/gun_shoot_war_apkmonk.pdfIn PDF document text
    • https://cdn.sqhk.co/kosifodalab/id62jhp/zexutorunowigapizurex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_603621577cc38.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://penanaras.myartsonline.com/72132679066.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24c7abdc-ceee-4f01-a93c-c81e9b9980da/witopotipamaribofanowi.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/15958750549.pdfIn PDF document text
    • https://s3.amazonaws.com/dafumuxitupav/62728731832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca813867-3d7f-4ffa-920d-8cd8f91757fc/price_of_small_generac_generator.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/92949955832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d5af80f-72af-4397-ae48-875b6f1515bd/can_samsung_s9_battery_be_replaced.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa2bf926-ae1a-4a3f-b068-c5246480b093/71041742620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f1e7e6-46e7-4df3-934e-6628ca1e4335/rebekilekofev.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_off0000fbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEE 5548 bytes
SHA-256: 154ea68b791ff7f72eb78b6d5181565fa00f32bdbf11703b5a16dfb767a50d37
font_01_sfnt_off00010ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA8 10688 bytes
SHA-256: ef80b8097542e5a3cdd8a9ff8c35f0d83ebeede866727910f0217c72a4072f89

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