Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdeeb771949ff179…

MALICIOUS

PDF

71.5 KB Created: 2021-01-19 16:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c81d8e5cba6108aa12484aeb4a90692e SHA-1: 76d63023a958a5c0b46a73aefdad9ef536ba6623 SHA-256: bdeeb771949ff17981bca4128b2d803e9563d5ed4baedb3578fa156fe720bb2f
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The sample is a PDF containing numerous links to external PDFs, many of which are hosted on suspicious domains or link farms. A critical heuristic indicates the PDF links to known malicious redirector infrastructure. Furthermore, the document contains a lure to copy/paste content into a shell, suggesting an attempt to trick the user into executing commands. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://traffine.ru/aws?utm_term=redhat+6+iso+image In PDF document text
    • https://putebofodabisig.weebly.com/uploads/1/3/4/3/134368176/3e6023c1b9e270a.pdfIn PDF document text
    • http://sodiwemewobigi.22web.org/31871609309.pdfIn PDF document text
    • http://vafakewa.iblogger.org/general_anti_avoidance_rule.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459625/normal_5fc87a6a27fd3.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/garorowa/outbound_sales_skills_test_answers.pdfIn PDF document text
    • http://jexiduro.rf.gd/labelling_triangles_opposite_adjacent_hypotenuse_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/86754417939.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/asura_arasan_hollywood_movie_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/happy_wheels_3_unblocked.pdfIn PDF document text
    • http://pixuxurarosu.epizy.com/92879206487.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/15317109950.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/sinonimo_da_palavra_inconformismo.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_off0000da6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6C 5272 bytes
SHA-256: 311508ddc91e64097b620db15ccb244fe6a461f77711ba3a37b65792eeb4b81a
font_01_sfnt_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 10960 bytes
SHA-256: 1d73c1022572963cc34e2250b2c98031f6f7f89367e28745b89b2f101d972976

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