Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fec18bbd192d3c5…

MALICIOUS

PDF

71.9 KB Created: 2020-12-18 16:02:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7f94d39e550717434896ab4ead01a473 SHA-1: eb1c9a18abf8dbb417150d72827694eb64f73f77 SHA-256: 3fec18bbd192d3c5dda4e13cdeaabbe9608b7b0ef32691544dbadc46b4cbd404
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to a suspicious URL. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external PDF links, suggesting a link farm. The ML classifier and ClamAV also flagged the file as malicious, supporting a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/123?utm_term=agha+shahid+ali+books In PDF document text
    • https://wunaramalus.weebly.com/uploads/1/3/4/5/134576193/9333711.pdfIn PDF document text
    • https://zisinifaja.weebly.com/uploads/1/3/4/5/134599776/sumanufavakik_xabavivipipox.pdfIn PDF document text
    • https://mufunada.weebly.com/uploads/1/3/4/6/134623537/tififumimupibereb.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/dazuxujepov/unisa_bursary_application_form_2020.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc9bbe50f46d6500014148/t/5fdca564398d112f3d7ab779/1608295781347/64958388910.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17632302-c526-4473-91aa-ffe8e25a5f96/adult_lego_sets.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe13139d79364840565600/1606292244318/the_iliad_translated_by_robert_fagles.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/famijozuvaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b484d89b-533b-4482-8fe8-da9d410fec7d/2005_yz_125_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/veselijaxivaxuduviroj.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dd745bcb0228a2824d01/t/5fc4c6154e98326c02a7acef/1606731286107/successful_peer_mentoring_programs.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/kulimukabajojupoxu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1343bd26ff1194f75a191/t/5fc622593570fb44d1d42fc4/1606820441084/osrs_wyvern_shield.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ddf8d7c-7509-46b3-a556-b43314042aa2/one_step_equations_with_fractions_worksheets.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_off0000d5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E4 5184 bytes
SHA-256: 8da661eac03b7592e057e03f822d9ad4b537ab78228cfd0a75d798058a96f0bb
font_01_sfnt_off0000e783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE783 13332 bytes
SHA-256: d4e4e6846f1acc8252ea4362fc418cb2127dd2c8499bba9034422a3202f1bd17

Open this report in the interactive analyzer, or submit your own file for analysis.