Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4af7d8aafd58e97…

MALICIOUS

PDF

80.4 KB Created: 2021-02-11 19:00:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9764e601c77672e3efce6e3a4d4b3c30 SHA-1: 57c25272a1c32e95cfea8f5de8e90c031e7ce928 SHA-256: b4af7d8aafd58e97244b4bb48fa144976cabe073b399ed2be52d133010e7995e
214 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=livenettv+apk+firestick In PDF document text
    • https://fumasidabufip.weebly.com/uploads/1/3/0/7/130775820/5519883.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/A0a5hiH/tasty_words_level_6.pdfIn PDF document text
    • http://reduslim-italy.site/5633400292l4djk.pdfIn PDF document text
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/xebamapumiwu_woribavunefamob.pdfIn PDF document text
    • https://cdn.sqhk.co/sepolulegaba/wogcFha/free_electrical_calculator_app.pdfIn PDF document text
    • https://cdn.sqhk.co/mudonisogub/jbhfhg5/yahoo_games_text_twist_1.pdfIn PDF document text
    • https://tovijivesigaz.weebly.com/uploads/1/3/5/3/135327805/miven.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/davolazupivowi/6019750848.pdfIn PDF document text
    • https://s3.amazonaws.com/lazesej/gevamujagesemekigodove.pdfIn PDF document text
    • http://deketinak.rf.gd/palolesusekebog.pdfIn PDF document text
    • http://faperolakaf.rf.gd/zuwod.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/58174239263.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/gmat_official_guide_2018_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/94186105895.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/babuwonuvefozubad.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD055 5044 bytes
SHA-256: 179fb737bd4aa58abab3dbdac8e4c63d21c7921931662e07cfd6e406aebafb81
font_01_sfnt_off0000e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 6436 bytes
SHA-256: 7ab1b1d5bea131eb021d21680ed0e4b4da52c569f2a9edcb86d2a5a780c98e7d
font_02_sfnt_off0000f796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 10768 bytes
SHA-256: c7a7a6a89567fbfb4d965c3043e0412833e6aacd89d8365157665e3df6531e1e
font_03_sfnt_off00011c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5A 17028 bytes
SHA-256: 3c3f37c9139a24a69fbc34f3557bfad426c510a40b985f390ea2dcb60b7e7692

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