Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e693079a50132f3…

MALICIOUS

PDF

72.0 KB Created: 2021-02-13 18:04:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 0262ed8a83fad7d22f3ba5374a8fe9f8 SHA-1: fcdfbfdc3bc1d1e0e763db3274cc81c7d24b6587 SHA-256: 4e693079a50132f363f2834508661068fa340616a4b9084535d03570b2338af6
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious links, including a critical finding for a known malicious redirector. The embedded URLs, such as 'https://yafferge.ru/wix?keyword=lakeside+arena+darts' and 'http://privateguardingserviceagainstdanger.site/6031086907gxcmz.pdf', are designed to lead the user to potentially harmful content. The ML classifier and ClamAV detection further support the malicious nature of this file, likely used as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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/wix?keyword=lakeside+arena+darts In PDF document text
    • http://rutevelafi.iblogger.org/wewepavadoguvoxuxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377414/normal_601f12d2eb4af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481406/normal_60038cf63094b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505820/normal_601faeae209d9.pdfIn PDF document text
    • http://openlait.pro/charities_sorp_frs_102_trustees_reportckvzm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450434/normal_5fcf845bf02cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487906/normal_5ff5b11a12098.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496146/normal_5fecf60fa49d9.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/6031086907gxcmz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408321/normal_5fe2c290d9853.pdfIn PDF document text
    • http://noxugimeto.iblogger.org/pikachu_game_karo.pdfIn PDF document text
    • http://xizabif.22web.org/melepilavilexusi.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/hfhfoib/vuror.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lotifajabam.epizy.com/38308497149.pdfIn PDF document text
    • http://gijawiravutul.epizy.com/animated_powerpoint_presentation_template_free.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_off0000d8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F9 4792 bytes
SHA-256: 63cf96949b70aa81e9ebd780365ca53b31deb38c7153af4b8524eb03cc37839d
font_01_sfnt_off0000e954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 13236 bytes
SHA-256: 3208415ae154e9b2d96f3792f5a4457f833c50cbc16bc2b30296f3d71b2df1f6

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