Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d23d05cc9b889b…

MALICIOUS

PDF

72.9 KB Created: 2021-02-08 22:37:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d3582e567635ecc43f08d568c2baca41 SHA-1: 510c1c67d81ca0c38cea648e32f44258203bde91 SHA-256: e1d23d05cc9b889b92c1bae0ae1dc6543fb61e92104b1470bcd4a3b16bf3e471
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link to a known malicious redirector, yafferge.ru, which is designed to lead users to download malware. The presence of a 'download button' heuristic further supports the phishing lure. ClamAV detection and ML classification strongly indicate malicious intent, likely to exploit the user into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/aws?utm_term=candy+crush+friends+saga+apk+pc In PDF document text
    • http://zuferiwabofeg.22web.org/cid_episode_2018_3gp.pdfIn PDF document text
    • https://cdn.sqhk.co/rozopebak/gjjgjia/terebakazebef.pdfIn PDF document text
    • http://lnstagram-badge-verification.com/borrador_definicion_informaticabo82k.pdfIn PDF document text
    • http://tranquils.space/88035851738cbdpl.pdfIn PDF document text
    • http://alexandreablog.com/847057888664056i.pdfIn PDF document text
    • http://repair-monokoles.ru/98014926298gtzun.pdfIn PDF document text
    • http://iglivesupportteam.com/18160706176h9bgy.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/ifOwjij/ice_cream_shop_near_me_hiring.pdfIn PDF document text
    • https://cdn.sqhk.co/vufisolepu/FjfSYjc/57393278227.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/alien_vs_predator_movie_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/ab-_soul_these_days.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/13907250310.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/cydia_para_android_2018.pdfIn PDF document text
    • http://nuvitaros.epizy.com/built_in_grill_reviews_consumer_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/bee_gees_hits_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/grade_2_phonics_test.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_off0000dede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDE 5456 bytes
SHA-256: 8b4ad1b9d21a43b740093a4db95a681a541ad065be3566404fa9b5399994ee8e
font_01_sfnt_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 11004 bytes
SHA-256: dc8d3882d0d1e0f6e9803c202f4ef974d30bd9d998853e6a918f8da527e1ef52

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