Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc5f52f64a008e6…

MALICIOUS

PDF

80.2 KB Created: 2021-02-17 05:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 836792d7fd024c81dfaf99a5062a283d SHA-1: 0fb0c4081836d649d19a39b87357cabfb3cde1f7 SHA-256: 9dc5f52f64a008e63ec43f823a4c116851b77fd4347a516ab5f731c1a046c2d2
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains or link farms, suggesting a campaign to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains text related to a 'smoke and carbon monoxide detector', likely a lure to encourage clicks on the embedded URLs.

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
  • 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://bologen.ru/aws?utm_term=first+alert+smoke+and+carbon+monoxide+detector+battery+operated PDF link annotation
    • https://cdn.sqhk.co/bowevuva/hggeggc/83367680419.pdfIn PDF document text
    • https://pogunokele.weebly.com/uploads/1/3/0/7/130739789/1c1d26dc3675e3.pdfIn PDF document text
    • https://menafove.weebly.com/uploads/1/3/1/4/131438456/1758131.pdfIn PDF document text
    • http://mogoxopedutisaw.iblogger.org/online_feedback_system_project_report_in_php.pdfIn PDF document text
    • http://fegebekuxew.22web.org/wagutaropor.pdfIn PDF document text
    • https://cdn.sqhk.co/setawigiz/Jhj6xgf/rayman_adventures_mod_apk_latest_version.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiminiv/jaJhbhi/free_spring_wallpaper_for_iphone_8.pdfIn PDF document text
    • https://nonujokos.weebly.com/uploads/1/3/0/7/130775252/8dd5063d.pdfIn PDF document text
    • https://mugejonisisekof.weebly.com/uploads/1/3/1/4/131437633/6f14dad.pdfIn PDF document text
    • https://jejonogukoji.weebly.com/uploads/1/3/4/8/134864124/903192.pdfIn PDF document text
    • https://gepavemu.weebly.com/uploads/1/3/4/8/134861499/f4ca73c.pdfIn PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/xegurebeb-pajovov-juvove.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pugonekiwijotom.rf.gd/gondor_theme_piano_sheet_music.pdfIn PDF document text
    • http://gamugeko.rf.gd/12055402134.pdfIn PDF document text
    • http://guvenup.epizy.com/figurative_language_in_poetry_analysis_worksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC80 5336 bytes
SHA-256: 3e8d44e147107d98a97a92bbfa92e3abcd4c971f6d18e818aa1fba7f10b3a12c
font_01_sfnt_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 10800 bytes
SHA-256: 51085577a96d166f1478f5c94aa413e28c481cc61a7a66c5565ad3560bc99c4d
font_02_sfnt_off0001237e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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