Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d9e033c2ce1430…

MALICIOUS

PDF

71.2 KB Created: 2021-03-16 21:44:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f0b69f56d237617861b3ac7ce91e090c SHA-1: 9d291f350118af980be9d2ba2a7288ab7100e48f SHA-256: c8d9e033c2ce14304078e58a4378b794890de071a0503e79ad8094dfd75e15a0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://fokemale.ru/wix?keyword=vital+care+medical+brampton PDF link annotation
    • https://cdn.sqhk.co/jesarijufe/yLxHPgi/hepatic_encephalopathy_nice_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/fgcviiJ/70698073768.pdfIn PDF document text
    • https://cdn.sqhk.co/wamefuvew/Kjiqcig/shell_cognitive_test_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/nezuxada/tZxijig/vilatolasopuno.pdfIn PDF document text
    • http://kegodedeta.iblogger.org/apfelkuchen_rezept_einfach_springform_mit_streusel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377414/normal_5fcebd6935576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499958/normal_60468c645fb12.pdfIn PDF document text
    • https://cdn.sqhk.co/kidirugolo/hbDxHXq/29957335900.pdfIn PDF document text
    • https://cdn.sqhk.co/tegatiwuwax/heugjhe/51079978483.pdfIn PDF document text
    • https://beluloxepivizor.weebly.com/uploads/1/3/4/1/134131295/gutuwuk-kipotusolum-duresawudit-derobipumax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384030/normal_5ffb6ea535aea.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/fheLJQU/download_galaxy_glory_mod_apk_unlimited_money_2020.pdfIn PDF document text
    • https://lojopozubog.weebly.com/uploads/1/3/1/6/131606756/fuvuw-gakes-suxuzojiziz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420454/normal_601e24dbb138b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tewilojejesuj.epizy.com/android_recyclerview_tutorial_kotlin.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_off0000d899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD899 5148 bytes
SHA-256: ba1a448eddc2a9ba7cb4bc8ff0fa53b71c75e3f150e44a5278b4f3004b2f1c0a
font_01_sfnt_off0000e9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 11168 bytes
SHA-256: eb9efc821f98e757a960b11940220aa59a939a37e07e34a043d4506c9d6bb987

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