Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b179aa429b30d7b…

MALICIOUS

PDF

81.1 KB Created: 2021-02-25 13:42:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b418e0689a0fa1716337c7bb913777d7 SHA-1: 334c1a6c011ddd21a8518f6a7c69ad0818e28b1c SHA-256: 4b179aa429b30d7b24c171076071a6145a3e312a71cacb875eb84ec0114b450d
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of embedded links, many pointing to potentially malicious redirectors, and a specific URL `https://yafferge.ru/wix?keyword=8th+grade+washington+dc+trip+2021` is present. The document body, though heavily obfuscated, appears to be a lure related to a school trip, which is a common tactic for phishing or malware distribution.

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=8th+grade+washington+dc+trip+2021 In PDF document text
    • https://cdn.sqhk.co/favejofu/caw9jdC/bodivebujebuvopagedanotag.pdfIn PDF document text
    • http://kuroramogesok.iblogger.org/72159723983.pdfIn PDF document text
    • https://cdn.sqhk.co/tijatabov/ijc77M4/vataxavuwu.pdfIn PDF document text
    • https://kofodurulivikaf.weebly.com/uploads/1/3/3/9/133997487/8152406.pdfIn PDF document text
    • http://lurugusop.iblogger.org/38826526759.pdfIn PDF document text
    • https://nebomigefut.weebly.com/uploads/1/3/4/3/134359696/solufupamar-sinib-vukekuwazamemaf-walegaboliwotaj.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/pjcwggp/85347051565.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/sepawi/lotajazewozosatimirufu.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/bmw_s1000rr_2019_hd_wallpaper.pdfIn PDF document text
    • http://duxasowasosa.rf.gd/fd130_duo_paper_size.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/mupamejerawi.pdfIn PDF document text
    • http://fusizizugunu.epizy.com/manosidegikizekut.pdfIn PDF document text
    • http://sisizovomejefi.epizy.com/zaretakizuvigadiju.pdfIn PDF document text
    • http://pavosalilob.rf.gd/nice_guidelines_pancreatic_cancer_treatment.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/graphing_rational_functions_worksheet_2_key.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/82204039014.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB4 5820 bytes
SHA-256: a240602be6f8f7a5eb7a0b58ab49aec8b15b9b97fdddff4acc850aeaf64d08cb
font_01_sfnt_off00011093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11093 11316 bytes
SHA-256: 2d66384eedffdcc2b4bc1a920bd5bb6f8ff568dfdf332d81aabda701dccfdf4b

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