Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8396453a23b455…

MALICIOUS

PDF

71.0 KB Created: 2021-02-14 01:43:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5b8ceb76f88cab5ee9ec6de7f14784b6 SHA-1: 17451c31cd7eddd311853e9bc9fd972fc809bff8 SHA-256: dd8396453a23b4553297bc2b28ed92bc07b5040ff8260145555fe86c994f3b26
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, indicating it likely exploits a vulnerability or attempts to trick the user. It contains a large number of embedded links, many pointing to disposable hosting or redirector infrastructure, suggesting a link farm designed to distribute malware or conduct phishing. The primary malicious URL identified is https://yafferge.ru/123?utm_term=finding+basic+trig+ratios+worksheet+answers.

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
  • 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.
  • 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.
  • 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/123?utm_term=finding+basic+trig+ratios+worksheet+answers In PDF document text
    • https://tilavulam.weebly.com/uploads/1/3/0/7/130739056/2f0d5ad8c4.pdfIn PDF document text
    • https://falesejus.weebly.com/uploads/1/3/1/4/131483218/8620454.pdfIn PDF document text
    • https://debinezituxi.weebly.com/uploads/1/3/4/3/134339783/76a0089.pdfIn PDF document text
    • https://xufidevudog.weebly.com/uploads/1/3/4/3/134389214/rudujuvowemenow.pdfIn PDF document text
    • https://newadagunezadev.weebly.com/uploads/1/3/4/6/134684801/kojaleladuliw.pdfIn PDF document text
    • https://cdn.sqhk.co/wefopijupe/hcfhdcI/xubobodutereb.pdfIn PDF document text
    • https://cdn.sqhk.co/medukukekuke/FpY9lgj/raspberry_jam_bars.pdfIn PDF document text
    • https://zitidimesefe.weebly.com/uploads/1/3/1/6/131606065/c270b5f7ca.pdfIn PDF document text
    • https://nuzojumikosa.weebly.com/uploads/1/3/0/8/130814298/1058033.pdfIn PDF document text
    • https://retezuve.weebly.com/uploads/1/3/2/7/132741149/volifabofisejaw.pdfIn PDF document text
    • https://mawetifatine.weebly.com/uploads/1/3/2/6/132683292/17fe11.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/aTjl8ih/real_3d_racing.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/tosevud/68428827297.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/5159818703.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/38929825980.pdfIn PDF document text
    • http://latilofu.rf.gd/ye_pal_yaad_aayenge_video_song.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_off0000d92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92E 5420 bytes
SHA-256: 96cd0e8397577007ee20c3c8a0134c7e09454bd302d8b224685dce915af4811e
font_01_sfnt_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 10196 bytes
SHA-256: 55691cf75fa4a7cc9e9ce5ed3b226c4debee718d6aa927435f9ac2f225dc860b

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