Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ccced0dad8d1ab…

MALICIOUS

PDF

74.5 KB Created: 2021-03-30 16:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0046b9d5b7b41caa1a1aaf9b4659c53e SHA-1: e9117fb3fed3d1d3126011c30fc6af40688e8f65 SHA-256: e5ccced0dad8d1ab85fc13473bf3611aa10ebf22c4608998aefc0181ec9e2962
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'work aptitude test pdf', suggesting a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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.
  • 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://crophysi.ru/award?keyword=work+aptitude+test+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391899/normal_5fdc3725e09c8.pdfIn PDF document text
    • https://molireju.weebly.com/uploads/1/3/4/6/134630509/zusofe-vexuroxej-jodotun-zupureter.pdfIn PDF document text
    • https://bevowodawalejap.weebly.com/uploads/1/3/4/3/134363876/bc4585778.pdfIn PDF document text
    • http://vexizudu.medianewsonline.com/arduino_projects_tutorial.pdfIn PDF document text
    • http://sandwichhq.club/senotiwhfwgy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403117/normal_5feec9baa0acc.pdfIn PDF document text
    • http://nebo-baikala.ru/how_to_use_the_lego_advent_calendar5bqxm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481068/normal_6018cf69230c0.pdfIn PDF document text
    • http://adminhalil.com/peace_like_a_river_book_sparknotes0ocmf.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/76749017109.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/vapite/80839075891.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/kuching_sarawak_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/best_ebook_reader_for_android_quora.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/icinga2_setup_guide_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/32368763075.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_off0000e736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE736 5080 bytes
SHA-256: b315bb6f28eedbe649c4c1478634995cc5eb8a9edfbef0c5ba229613b711dbdd
font_01_sfnt_off0000f89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 10796 bytes
SHA-256: 45de143244dcd87404929f8c4327e4a00819ba5deae808dc967832a2be95e681

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