Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9f9bb74f081316…

MALICIOUS

PDF

71.7 KB Created: 2021-02-13 06:26:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 43d62d278da556c96641ba19ca0fbfc0 SHA-1: 95c25b8899708123409d1b5a420d0321b7708e74 SHA-256: 0b9f9bb74f081316db1fb0387e9a1596e55c74ffae300054ce8b9f1ceea8f274
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://druttle.ru/wb?keyword=acog%20gestational%20diabetes%20screening%20guidelines%202011', suggesting a phishing or redirection attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wb?keyword=acog%20gestational%20diabetes%20screening%20guidelines%202011 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367903/normal_601241b2ed18b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476766/normal_5fcbceda5b0c3.pdfIn PDF document text
    • https://cdn.sqhk.co/gegojagakexu/jhbbgi3/real_gangster_crime_game_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417999/normal_5fdfd290759ee.pdfIn PDF document text
    • https://cdn.sqhk.co/fusureviweki/XZifwia/10741810943.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380237/normal_5fd0524de93c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408593/normal_601c944b1e61c.pdfIn PDF document text
    • http://rirelavemug.iblogger.org/tefemul.pdfIn PDF document text
    • https://cdn.sqhk.co/pixefavenar/0rbqicB/badlands_national_park_entrance_fee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490140/normal_5ffc2b0e10e9c.pdfIn PDF document text
    • http://freshnatur.fun/arcadian_war_turtle_guide4zkay.pdfIn PDF document text
    • http://kernig.online/gajobodarorajenijibogobzvf3l.pdfIn PDF document text
    • http://mizarofu.22web.org/zexizimegovopinewu.pdfIn PDF document text
    • http://redirunna.xyz/team_bhp_full_formtpigj.pdfIn PDF document text
    • https://cdn.sqhk.co/seranowe/lqrm6ib/37566794290.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://modunatotuw.epizy.com/percentage_increase_decrease_word_problems_worksheet.pdfIn PDF document text
    • http://bezegorev.epizy.com/19556933811.pdfIn PDF document text
    • http://roparewuna.rf.gd/giginesaziridoxa.pdfIn PDF document text
    • http://besuwodusibix.rf.gd/audubon_field_guide_to_north_american_birds.pdfIn PDF document text
    • http://pasivete.epizy.com/79711651424.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_off0000db51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 5560 bytes
SHA-256: b02a88cc972e4d477d2bcc9dac42e6b5fa28b667da0f9fa022d46059cb938c11
font_01_sfnt_off0000ee4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 10284 bytes
SHA-256: 7dba8a2a15332adfdd2c099847b7057f1bacc0bd4d6ee27b3ff6934082dfaf70

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