Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1b4bbb0cde0c0a…

MALICIOUS

PDF

84.7 KB Created: 2021-03-28 21:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 70f6b3e92498986b9f2184a50eafd009 SHA-1: 9e98cf4897d229e5f73b4546d746b74000930917 SHA-256: 8a1b4bbb0cde0c0a7b8b49d570f6837a460c2325927aec513f36060b6086c575
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lead users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is used to host and link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/wix?keyword=helicon+voicelive+touch+manual PDF link annotation
    • http://lilakasidosusuw.iblogger.org/mixed_present_tenses_exercises_intermediate.pdfIn PDF document text
    • https://cdn.sqhk.co/nakotuba/jdgjia6/avast_vpn_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456667/normal_6033d1ed7659e.pdfIn PDF document text
    • https://bisubobotikimix.weebly.com/uploads/1/3/1/4/131438323/76aa8ef9f487bca.pdfIn PDF document text
    • https://voranafirodibug.weebly.com/uploads/1/3/2/6/132696030/19499.pdfIn PDF document text
    • https://bemiredo.weebly.com/uploads/1/3/5/3/135322707/telefo_nonagogifiwiro.pdfIn PDF document text
    • http://pogekoxuw.mygamesonline.org/varsity_college_application_form_2020.pdfIn PDF document text
    • https://vevorusafe.weebly.com/uploads/1/3/4/5/134516648/zujajusemepuxomamuz.pdfIn PDF document text
    • https://cdn.sqhk.co/sazurakuj/djgrji4/51712616599.pdfIn PDF document text
    • https://wotapidedodibi.weebly.com/uploads/1/3/4/4/134475573/9572473.pdfIn PDF document text
    • https://cdn.sqhk.co/fumazuri/elRnYjg/55622360817.pdfIn PDF document text
    • https://vokarojunez.weebly.com/uploads/1/3/2/6/132696330/3b51df77020c3d3.pdfIn PDF document text
    • https://xovixonu.weebly.com/uploads/1/3/4/8/134896571/6066184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379744/normal_600f9e8f0db6f.pdfIn PDF document text
    • http://vexoxem.scienceontheweb.net/historia_del_arte_bizantino.pdfIn PDF document text
    • http://kopalirigel.mypressonline.com/sql_server_2020_features.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dibirat.rf.gd/xesidovanode.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_off00010cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC1 4788 bytes
SHA-256: 220ffa229d8a8047968c8ac536cc6d4130aa9724c6201d94503e9305e7dac0c1
font_01_sfnt_off00011ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE3 11772 bytes
SHA-256: dc8b7da53dcb9dfb97fe069f02fa4d76ecd5ad667191d51c6c0dce6a8fbe2c83

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