Malicious PDF — malware analysis report

Static analysis result for SHA-256 47314be614e91a99…

MALICIOUS

PDF

76.4 KB Created: 2021-02-22 06:19:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c5bfd13770f7e59cdc0f41f2bb6c650c SHA-1: 99543232900c4431c30053ece9244ed7515019cc SHA-256: 47314be614e91a99f7d6b2764e509d2f0ff76e65b7c184cdf6055a6920477fe7
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File Execution: User Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. 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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://jacksth.ru/strik?utm_term=how+to+clean+a+sunbeam+heated+blanket PDF link annotation
    • http://b4shop.icu/the_human_condition_hannah_arendtsoc39.pdfIn PDF document text
    • http://mumewozifuvab.iblogger.org/ancient_greece_map_quiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446633/normal_6021d32968fbd.pdfIn PDF document text
    • http://jirafka.space/pisimoinhal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375352/normal_602e678e5d567.pdfIn PDF document text
    • http://runolive.com/kung_fu_panda_characters_wikipedia0cioo.pdfIn PDF document text
    • http://tarusexozof.iblogger.org/instagram_ios_11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414871/normal_5ff7b90e3b065.pdfIn PDF document text
    • http://3-bureaureport.info/area_and_perimeter_of_plane_shapes3slwb.pdfIn PDF document text
    • http://sarhello.online/baby_elephant_sewing_pattern_freeuhllz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446388/normal_600647e025aeb.pdfIn PDF document text
    • http://fb-ig-copyright.com/42050073455q6tn1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495551/normal_5fdd46c49b246.pdfIn PDF document text
    • http://brumbum6.xyz/nixon_the_unit_40_user_manualuzcgv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450247/normal_5fe9369f44a7b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fugewad.rf.gd/95258456160.pdfIn PDF document text
    • http://biziwinajivo.rf.gd/xaxogigo.pdfIn PDF document text
    • http://wubezirinipo.epizy.com/reporting_anova_results_f.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_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 5340 bytes
SHA-256: 224459fbb377f7d0629f6ea9fbbf62d1c659ee89e08d29665d91f2ec284351e4
font_01_sfnt_off0000ffbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBC 10652 bytes
SHA-256: a8ff7851f67e719711d54141d92c59e51f383cc57b09ae338812474739b7fa00

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