Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8adb6dded9b21c1…

MALICIOUS

PDF

76.0 KB Created: 2021-05-29 04:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6be496875eea08b697f793822dca132c SHA-1: 943b297e422872ff638030087ff6f09d8867cba3 SHA-256: c8adb6dded9b21c13efc2188759cab592cf1396c898d7c749e2c66e797008c79
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The embedded content, though heavily obfuscated, appears to be related to download lures, further supporting the phishing or malware distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://botokaw.ru/strik?utm_term=google+play+music+download+uptodown PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4503387/normal_5fcd2a35edeca.pdfIn PDF document text
    • https://xaxafojub.weebly.com/uploads/1/3/0/7/130738676/nugimopedeta.pdfIn PDF document text
    • https://wadozivapo.weebly.com/uploads/1/3/4/5/134512268/8905913.pdfIn PDF document text
    • https://fusewire.weebly.com/uploads/1/3/0/7/130776481/5955109.pdfIn PDF document text
    • https://vurinilobato.weebly.com/uploads/1/3/1/4/131454355/6f1d8a0840284.pdfIn PDF document text
    • https://ligefunodimab.weebly.com/uploads/1/3/1/3/131398292/tipobepakej.pdfIn PDF document text
    • https://kexexetipo.weebly.com/uploads/1/3/4/8/134897314/7dd883d.pdfIn PDF document text
    • https://siganagimub.weebly.com/uploads/1/3/2/6/132683357/waxaxekezodevud-gaxowesa-kesaxusesape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393514/normal_604223808299d.pdfIn PDF document text
    • https://fejenugid.weebly.com/uploads/1/3/4/0/134016750/zujuvaninag.pdfIn PDF document text
    • https://fowawuxubave.weebly.com/uploads/1/3/4/7/134759807/jotenabinu.pdfIn PDF document text
    • https://bozobamawokoruv.weebly.com/uploads/1/3/4/3/134350924/latotefukozebaz.pdfIn PDF document text
    • https://fifuvifelikedub.weebly.com/uploads/1/3/4/6/134662232/06b65e9449e56.pdfIn PDF document text
    • https://suzokapiwewop.weebly.com/uploads/1/3/4/3/134351383/gerafo.pdfIn PDF document text
    • https://kixaxadamakike.weebly.com/uploads/1/3/0/7/130775249/pijuxevejapalog_gepakumuvuwot.pdfIn PDF document text
    • https://wipuzene.weebly.com/uploads/1/3/5/9/135971348/zumedajeloz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388163/normal_5fc834e0e770f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d84dc4f8-1faa-4742-ae83-597e81764701/fifty_shades_of_grey_songs_mp3_download_320kbps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c784ae4-25e1-4c71-92a8-d98eb0eadbf5/wevukex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ca4038b-f565-4296-b1f7-a990dc10f7f2/ledabugegakanid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4d6496d-c34a-4d89-a589-bc2f9db44fbf/dish_network_receiver_keeps_restarting.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_off0000ecb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB6 5524 bytes
SHA-256: 1c66093f413498133737f005ba4aa1e9676065451d81de1d17e3da480cf4c44c
font_01_sfnt_off0000ff8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8E 10204 bytes
SHA-256: cf34c50feb116af4866ca21f7160778d8081f02b344153eb42b901a2dc9ed581