Malicious PDF — malware analysis report

Static analysis result for SHA-256 56695d9ab0a45241…

MALICIOUS

PDF

78.3 KB Created: 2021-03-29 19:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8dbbe0c8a4d4f8e2fe542e3817bb835b SHA-1: c8a555a132f2717f3844d5418775bfeadbc97a99 SHA-256: 56695d9ab0a45241db98a895bedd41181db662835fc4e27d7b3e11edd2f53aca
222 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a large number of external links suggestive of a link farm. The presence of a 'download button' lure further supports a phishing or malware distribution attempt. Although no scripts were extracted, the embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://dafemum.ru/123?utm_term=borland+c+compiler+version+5.+5+free In PDF document text
    • https://levobije.weebly.com/uploads/1/3/0/9/130969703/fa68f5acc6d16.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/43367775819.pdfIn PDF document text
    • https://fukimeremunosav.weebly.com/uploads/1/3/1/3/131379236/0253cb22e.pdfIn PDF document text
    • https://bemebedutor.weebly.com/uploads/1/3/4/6/134624352/vonaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aab33fc-6f3d-45f8-9d4b-f2f5b3f91606/pukijiwafupizigikukor.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/black_wallpaper_android_battery.pdfIn PDF document text
    • http://luvepel.myartsonline.com/9881811037.pdfIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_1224884a89284a9d90a2139da02a9657.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/what_the_bleep_down_the_rabbit_hole_trailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95a98292-733b-4a0c-9fe7-cba3918bd649/white_lion_facts_national_geographic.pdfIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_f8ceac50ff204a1b815d433356f2c045.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sabegokek/83566325403.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/mudilo.pdfIn PDF document text
    • https://cf21b241-1edd-4e7a-8b85-4b7fa12bec5a.filesusr.com/ugd/835652_3f41164846174844b77fe1576f634eec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/voxulija/86674074921.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_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 5568 bytes
SHA-256: 403bd3cfdcf6c65a5ab9bf25b4460309b9ee669c905500008fba22376cd227de
font_01_sfnt_off0000fe81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE81 15756 bytes
SHA-256: 63ac88c69c3c87a131ed8c0844930d9fa6d5307a61ea07ca4b747a1b442a7ae3

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