Malicious PDF — malware analysis report

Static analysis result for SHA-256 916623bec540e80f…

MALICIOUS

PDF

76.6 KB Created: 2020-11-22 00:29:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6b65e15e5b5ccad5b45443a6a5ae0239 SHA-1: b6c0045c7981d2cdb97dd2897d6f2683157a9fee SHA-256: 916623bec540e80f2b0da10194bb5f307aeb3b0947b7f91112d1af9da8d76c4b
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The presence of numerous links, including to external PDFs, suggests an attempt to lure users to potentially harmful sites or to distribute further malicious content.

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.
  • 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://ggtraff.ru/123?utm_term=uniform+density+curve In PDF document text
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/watibilawozolevif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421640/normal_5f9cc3699e897.pdfIn PDF document text
    • https://vugilove.weebly.com/uploads/1/3/4/2/134234765/3274250.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/divelikubapiwaj/ib_myp_biology_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/audio_converter_wma_to_wav_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/pangasinan_zip_code_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/nikukadunujuvojodisekiji.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/cara_membuat_soal_di_google_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/34847466778.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/92511295408.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/59385534347.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/wilkes_county_nc_register_of_deeds_online.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/72149265242.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A0 5080 bytes
SHA-256: ced79b615660152bd152fa96bc0601645d50fdd475252b58067350f5ccd11a62
font_01_sfnt_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 13168 bytes
SHA-256: 0e07016755c8a461e6b6ad57be38b557a3975d10ac00ba94443a8fb7b17639ca
font_02_sfnt_off000110e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E9 16060 bytes
SHA-256: fe9f335d0611d827ce88dc1c7cba7fb9f264c7c87fb33045be4a8b4ace16f02f

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