Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16766f8b6e6ec55…

MALICIOUS

PDF

70.0 KB Created: 2021-02-15 03:49:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f11a093f4eff4fa0447ce5733b3bea57 SHA-1: a1ac18c9eef0cc63a59738633d6a5d9ca294623b SHA-256: d16766f8b6e6ec5562c6d55aaf48cb6247c4e0c843619d943f62079c37509730
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous embedded URLs that point to link farms and redirectors, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs are designed to lure users to potentially malicious sites, which is a common tactic for phishing or distributing further malware.

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://yafferge.ru/wb?keyword=significant%20figures%20worksheet%20physical%20science In PDF document text
    • https://cdn.sqhk.co/vexerofexe/bjhefrA/tizefafezizuvemob.pdfIn PDF document text
    • https://cdn.sqhk.co/zamokaxu/djfFcAp/spanish_word_of_the_day_app_android.pdfIn PDF document text
    • https://mufisifarugevap.weebly.com/uploads/1/3/4/5/134595961/jorogolij.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/9gee0ji/11782016281.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/jjegg0Y/60071984898.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/mipizaju/kuxepozozexaveleguni.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/boosted_performance_370z_single_turbo.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/falipopomunega.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/allen_bradley_powerflex_525.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/tv_now_exclusiv_die_reportage.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/adobe_character_animator_cc_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/97532924999.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/advanced_javascript_examples_with_code.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/43241806257.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/java_file_to_folder.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/sasamuvosixawikowi.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/savings_bond_informer_website.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/basic_vietnamese_words.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_off0000d34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34E 5640 bytes
SHA-256: 970762130965a276509205a85808d560af94f53b45070af7291962fd087cdeb3
font_01_sfnt_off0000e69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69C 10540 bytes
SHA-256: 9631ecde6fb4dd34193726708e53eb07d3947398f997603e71c23c14d1106d60

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