Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff972cda2730a6e…

MALICIOUS

PDF

73.3 KB Created: 2021-01-08 09:35:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 11efe16dfef30355a818a27675d5855f SHA-1: 549aa7fcec0c60e91e7086a596dd291dc17801a3 SHA-256: aff972cda2730a6e21b9c00f6f6fc36a6387fe6014fd7dae212c0f778230dba9
204 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains numerous external links, forming a link farm, with one prominent URL pointing to 'trafffi.ru' which is associated with a cracked software lure. The presence of a 'download button' lure and instructions for a password-protected archive suggest a multi-stage attack designed to bypass security measures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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
  • 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://trafffi.ru/aws?utm_term=apowermirror+crack+version PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413701/normal_5fed2be35334d.pdfIn PDF document text
    • https://ripabukufekova.weebly.com/uploads/1/3/0/7/130738984/907df0450.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465250/normal_5fad89932600d.pdfIn PDF document text
    • https://vexinafofonazes.weebly.com/uploads/1/3/1/8/131871992/jijosiruzesuj_pafira_tuzop.pdfIn PDF document text
    • https://mawikimame.weebly.com/uploads/1/3/4/2/134235565/d39c5.pdfIn PDF document text
    • https://siresikewutawin.weebly.com/uploads/1/3/0/7/130739490/9810834.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/pirofopafu/sututomupilisu.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/36683824231.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/adding_and_subtracting_algebraic_fractions_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/best_avatar_games_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/android_device_manager_official_site.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccc8cba0-c1ef-47c4-8df8-05f8db434f06/76106592088.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/31709152986.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/chicago_style_referencing_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f0603f6-0bdf-4ff6-9c01-2c9c412f2868/dexovadananiwazofazujezaj.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/30401955593.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_off0000e170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE170 5252 bytes
SHA-256: 630b7fc642fe8764b4bc054400dc0ac9cbc7bcfa643d9f8c78980a6a64834a8e
font_01_sfnt_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 10732 bytes
SHA-256: 8b4b61e4881217ef3eb20cd824a2717b086a86b6ebca2129e9c0071b5c95aca9

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