Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44151467032f1a4…

MALICIOUS

PDF

75.3 KB Created: 2021-02-16 05:00:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6013548fbbd5a592ba07578aed4535a6 SHA-1: e102819f7d91cebb3dc3fbf0bdec95347fbeec7f SHA-256: a44151467032f1a4c813bfe78b320e4b1eafaa6a9be0a68069808182bd7dbbb4
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'https://yafferge.ru/strik?utm_term=kirby+vacuum+supplies+near+me'. This URL is likely used to lure the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL in a PDF is a strong indicator of a phishing or malware delivery attempt.

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/strik?utm_term=kirby+vacuum+supplies+near+me In PDF document text
    • http://zasosidimul.22web.org/html_format_number_output.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/action_sheet_in_swift_4le3kt.pdfIn PDF document text
    • http://help-feedback-amzn6.xyz/95835196589nw9z5.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/hcfkje2/birdman_and_toni_braxton.pdfIn PDF document text
    • https://cdn.sqhk.co/mewobonovagi/jeDEicT/whip_ringtone_big_bang_theory.pdfIn PDF document text
    • http://testertumentum.space/91213559462qrs4o.pdfIn PDF document text
    • http://carbags.site/international_postal_address_format_spainusupq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388046/normal_5fed653a7056e.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/fajujiju/8192607716.pdfIn PDF document text
    • http://tiguvazigavis.epizy.com/comprehension_exercises_for_class_7_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/kalefaxutatolavuge.pdfIn PDF document text
    • http://pugavidugipiton.rf.gd/55777818633.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/aha_cpr_guidelines_2018_infant.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/betpawa_ug_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/jorew.pdfIn PDF document text
    • http://kexeban.rf.gd/9291827898.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_off0000ea45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 5352 bytes
SHA-256: fbe7018146b014d0e993a92867b0a0115c8025f98a3472d2dd45c968ba5ad5a7
font_01_sfnt_off0000fc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC70 10424 bytes
SHA-256: 7845c4171e32fdef7620d54061fb1dbeea6ec0ee3053635d389d1fe330873f17

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