Malicious PDF — malware analysis report

Static analysis result for SHA-256 771a60687c4cc0f3…

MALICIOUS

PDF

72.4 KB Created: 2021-02-25 15:58:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 1026c8efbcf435ca686418bcfeba9df9 SHA-1: f795e6e7ac91b3a4926c59c46e9506192a7558c2 SHA-256: 771a60687c4cc0f3d6685af0b6257b0ea741aead43fd976023cd030d01532451
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/123?utm_term=eos+rebel+t4i+battery+charger'. This URL is presented in a context that appears to be a product listing, suggesting a phishing or malware distribution lure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL in a PDF document is a strong indicator of malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/123?utm_term=eos+rebel+t4i+battery+charger In PDF document text
    • http://fazejajogavu.medianewsonline.com/is_the_equity_market_open_on_columbus_day.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410214/normal_602c335e22060.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466376/normal_5ff289612efd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384822/normal_6028558a086cf.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/how_to_clean_aroma_rice_cooker.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419192/normal_5fe6c00b155af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407664/normal_6006c82683dbd.pdfIn PDF document text
    • http://parhelifrl.space/bonorejozesafitiroxonijivwpuc.pdfIn PDF document text
    • http://adanakebap.org/gepebobugowafekws26i.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/getizar/ranudoxeluxabinisoxas.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/29970292480.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/wupirawaj.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/ms_access_accounting_template.pdfIn PDF document text
    • http://pujumek.myartsonline.com/french_revolution_third_estate_taxes.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/16932483615.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/5343003941.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/5615427833.pdfIn PDF document text
    • http://girofili.myartsonline.com/how_to_play_old_game_of_life.pdfIn PDF document text
    • http://rujidafedisezu.atwebpages.com/how_much_do_clinical_psychologists_with_a_doctorate_make.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_off0000ced8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED8 5028 bytes
SHA-256: adb3504baad025516ecda50c098ca562a349b99f076c850ef56207875fea9886
font_01_sfnt_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 11240 bytes
SHA-256: b424b110f049116795bafbab4418c0ac8ad049565364fea6c7b9b4d55d2370ff
font_02_sfnt_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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