Malicious PDF — malware analysis report

Static analysis result for SHA-256 caafc1dc7e8295cf…

MALICIOUS

PDF

76.4 KB Created: 2021-02-20 15:30:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c79b5d12ce496ff25bb29c19429e8ffb SHA-1: 0cde90baa9c8cdc744e0afb3a11cf9236b78683f SHA-256: caafc1dc7e8295cff88cd6250e93714f08d02335a5acecf2472c906df510953d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, 'https://bologen.ru/aws?utm_term=cisco+ccna+icnd1+practice+exam', suggests a lure related to IT certification exams. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://bologen.ru/aws?utm_term=cisco+ccna+icnd1+practice+exam PDF link annotation
    • https://vetasokimatajed.weebly.com/uploads/1/3/5/2/135296406/0b6d8cbbcf00.pdfIn PDF document text
    • http://pubguckazan.com/609878261641u4x5.pdfIn PDF document text
    • http://megesodore.iblogger.org/nakovo.pdfIn PDF document text
    • http://mavpa.fun/wevukagekue20vo.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/ghgjhoo/97713944123.pdfIn PDF document text
    • http://remont-kvartir-otzyvy.moscow/attestation_pole_emploi_cesuimp9h.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/ieOgiEO/wings_financial_woodbury_phone.pdfIn PDF document text
    • http://medgaj.com/pathophysiology_of_anemia_in_pregnancybii8l.pdfIn PDF document text
    • http://card2card.live/how_to_describe_climate_weather_differentbpwjb.pdfIn PDF document text
    • https://cdn.sqhk.co/nuditufu/jjhjiNJ/64538626487.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/kugelilizibuwum/relinopad.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/browning_a5_choke_tube_stuck.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/efficient_and_robust_automated_machine_learning.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/school_bully_pc_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/pubotegetekizerobudetesi.pdfIn PDF document text
    • http://lejamezi.rf.gd/how_to_calculate_standard_normal_distribution_without_table.pdfIn PDF document text
    • http://gorefoverotiw.epizy.com/18831186590.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/set_theory_venn_diagrams_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/doluxegifulexelenof.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_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 5116 bytes
SHA-256: b8345d577bdec86558e015c2756a56bd5e3227391ad09fb6c8d7554a176a730d
font_01_sfnt_off0000ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 11708 bytes
SHA-256: 0c15bb48dc16749124f24c7363575d40f1032a920bbfec58c4031962fb0c7621
font_02_sfnt_off00011661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11661 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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