Malicious PDF — malware analysis report

Static analysis result for SHA-256 88476e47613f73e1…

MALICIOUS

PDF

71.6 KB Created: 2021-02-10 10:10:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 41e7cdef86ac35ff9b516ceec892829b SHA-1: 24d8239dbb8636b1e5ca32f6123f845775467c6d SHA-256: 88476e47613f73e1b26c565bc2085d5823c7cc2f4022b31f781477b64361458b
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics indicate an attempt to redirect users to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://baarspo.ru/aws?utm_term=pdfbox+default+appearance+string PDF link annotation
    • https://gemiporelowagi.weebly.com/uploads/1/3/0/7/130775846/jigibivixiko.pdfIn PDF document text
    • https://cdn.sqhk.co/zosurinipin/Xgchcjc/xibikafukemelunojem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485826/normal_5fc7bd0c3b244.pdfIn PDF document text
    • http://xewuxufulizifu.22web.org/mezokumalile.pdfIn PDF document text
    • http://safodimim.iblogger.org/update_row_sqlite_android.pdfIn PDF document text
    • https://zifokodogip.weebly.com/uploads/1/3/1/3/131398222/pokemefuwure.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/KOihd4Z/hi-_q_mp3_voice_recorder_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470979/normal_5fe4cb126ab11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409811/normal_5fcc078e57e6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454306/normal_601b701e054c1.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/OgkjbW5/e_bike_conversion_kit_mid_drive.pdfIn PDF document text
    • https://jozufibajas.weebly.com/uploads/1/3/0/9/130969385/wezobifegaropix.pdfIn PDF document text
    • https://kujakaxu.weebly.com/uploads/1/3/5/3/135347331/fewulepamon.pdfIn PDF document text
    • https://tikodukika.weebly.com/uploads/1/3/0/7/130776738/xuwitobe_pumameralexemiv.pdfIn PDF document text
    • https://tusululobiwivet.weebly.com/uploads/1/3/1/1/131163859/dizogofa.pdfIn PDF document text
    • https://cdn.sqhk.co/rotuzuwibi/gKUhBgc/3095891680.pdfIn PDF document text
    • https://sinuxogutit.weebly.com/uploads/1/3/4/5/134505158/9597c5cf92f9.pdfIn PDF document text
    • https://kusikulovaledif.weebly.com/uploads/1/3/1/6/131606813/5229917.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/wopari/6303612503.pdfIn PDF document text
    • http://fadadopotonu.epizy.com/50449369305.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/clinical_anesthesia_book.pdfIn PDF document text
    • http://muvusibose.rf.gd/xegawukuxagisuz.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_off0000d900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD900 5532 bytes
SHA-256: 985ddb14f7113206ee0858c20d8467d88d5496ec268b3ab6877ab131346c539f
font_01_sfnt_off0000ebdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDF 10884 bytes
SHA-256: e875c4990563450bbb5f4ad853011af1fd865d4a37b2c18633bc4872af42541c