Malicious PDF — malware analysis report

Static analysis result for SHA-256 388c56fc0e7db32b…

MALICIOUS

PDF

73.1 KB Created: 2021-02-21 18:12:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6651126abaa146d4b5a8f96c67c4af3a SHA-1: 77210a265e57e4c01deadc60b20b5ea9d7cdb306 SHA-256: 388c56fc0e7db32b74f977924d52ba0ac2e6874028dbb97060df34efa6c56dd7
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to contain metadata related to a course catalog, likely used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://baarspo.ru/wix?keyword=edgenuity+2020+course+catalog PDF link annotation
    • https://mekegeno.weebly.com/uploads/1/3/1/8/131856852/5915471.pdfIn PDF document text
    • https://zokevuwokonumez.weebly.com/uploads/1/3/4/6/134682223/be280a.pdfIn PDF document text
    • https://cdn.sqhk.co/sevigexew/8SPMVhc/sports_scores_espn_hockey.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/BPWD2gg/91499673273.pdfIn PDF document text
    • https://gasagegote.weebly.com/uploads/1/3/4/3/134333211/bewaw.pdfIn PDF document text
    • http://online-sistem.site/cardiovascular_system_worksheet_middle_schoolgcxtn.pdfIn PDF document text
    • https://cdn.sqhk.co/vekotevudoze/kplhhfZ/83753616703.pdfIn PDF document text
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/tekezuvidufutebi.pdfIn PDF document text
    • https://cdn.sqhk.co/turaxulefa/hgRhcA7/bujaselezu.pdfIn PDF document text
    • https://nililekekikare.weebly.com/uploads/1/3/0/7/130739967/tubikalem.pdfIn PDF document text
    • https://cdn.sqhk.co/mepejuwaj/WsjqhgG/galaxy_attack_space_shooter_mod_apk_unlimited_coins.pdfIn PDF document text
    • http://thecet.xyz/99490787057ghnp7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ganakakene.epizy.com/4339934065.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/windows_7_32_bit_activation_crack.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD296 5320 bytes
SHA-256: c14edd06aa5d784c9adfe3d6e56dfd8aad113217ec0fce47cef9dacdfaaa7f31
font_01_sfnt_off0000e4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C0 11260 bytes
SHA-256: 2f2c4bc58ab1bae9e364a46635ac5288e1ec2abc2f97b4a33b67a342be5c16a5
font_02_sfnt_off00010950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10950 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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