Malicious PDF — malware analysis report

Static analysis result for SHA-256 66faf93ea38cfb6a…

MALICIOUS

PDF

71.6 KB Created: 2020-12-22 09:06:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d97b0218b1ff42f76fafc176683edf02 SHA-1: d353e3c875f829137e834aad82e3ced08de13fe0 SHA-256: 66faf93ea38cfb6a13b1ea92c6b40ea05038d9b40ade7768691cd80909e815f6
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL, 'https://trafficel.ru/strik?utm_term=bubble+dog+pet+grooming', is likely used to redirect users to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/strik?utm_term=bubble+dog+pet+grooming
    • https://zeginuvo.weebly.com/uploads/1/3/0/7/130775519/lobal-kukifusovi.pdf
    • https://pomitowu.weebly.com/uploads/1/3/4/3/134389192/2f7605de.pdf
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/dd0374.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0352cd48-deaf-4d12-8a16-a96eab3e6b22/ricardo_arjona_fuiste_tu_mp3_descarg.pdf
    • https://static1.squarespace.com/static/5fc27d2011f6a419848fbce5/t/5fd08e39fc93c51d16e11e89/1607503419553/skyward_pisd_prosper.pdf
    • https://uploads.strikinglycdn.com/files/41997543-9699-43ab-85b5-46bea9432363/larry_crane_the_abundance_book.pdf
    • https://uploads.strikinglycdn.com/files/8f563f84-927c-45a0-993b-8a30fefd6816/lexerebep.pdf
    • https://static1.squarespace.com/static/5fc7a29a717a0f60c4048903/t/5fd0760c89fd2c07d103cf25/1607497229768/celebrity_voice_changer_apk_pro.pdf
    • https://static1.squarespace.com/static/5fc6485be2fce462bcb09523/t/5fcf1dfd3fa051062b40c4a3/1607409150055/cbse_class_9_half_yearly_syllabus_2018-_19.pdf
    • https://static1.squarespace.com/static/5fc118f0bdb33045eec37880/t/5fc593784e98326c02d09903/1606783865105/wewubewo.pdf
    • https://s3.amazonaws.com/bepukuba/letter_of_recommendation_for_employee_template_word.pdf
    • https://uploads.strikinglycdn.com/files/f9ec0030-fa5a-482b-ac2e-42d13ab15680/84852554586.pdf
    • https://uploads.strikinglycdn.com/files/72e068ab-bb91-4016-81e8-310ac2d58231/36163632287.pdf
    • https://s3.amazonaws.com/gedimuta/kiwin.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbaf.bin
662cf12ec4151f556e5e74ccc02291b19b3673187cd885aec297414ba52847bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAF 5080 bytes
font_01_sfnt_off0000ecdd.bin
fa6fab9e591c5517410d2220612384a57039629bf99af2462505edd54786ebce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 10784 bytes

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