Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f258b86659adf3…

MALICIOUS

PDF

72.0 KB Created: 2021-01-10 01:39:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: adfbe580b54d4eb1e7e7db88e2f09d38 SHA-1: 25b4735119422aa820133c5339b981219c22c88b SHA-256: c6f258b86659adf37bc7bbf31b20ff02f5bf55352d0fecbc97ef5311f80f6bae
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to an 'eviction letter template california'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation for client execution via a malicious link. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://gettraff.ru/aws?utm_term=eviction+letter+template+california In PDF document text
    • https://site-1173505.mozfiles.com/files/1173505/ac_syndicate_steampunk_outfit.pdfIn PDF document text
    • https://site-1181045.mozfiles.com/files/1181045/los_sims_mobile_hack_apk_2020_ios.pdfIn PDF document text
    • https://site-1168325.mozfiles.com/files/1168325/weed_farmer_overgrown_apk_license.pdfIn PDF document text
    • https://site-1191354.mozfiles.com/files/1191354/pabila.pdfIn PDF document text
    • https://cdn.sqhk.co/naketego/getjYig/donkey_kong_game_and_watch_online.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/iiKibVQ/mojigavudadesukiw.pdfIn PDF document text
    • https://site-1232343.mozfiles.com/files/1232343/ocean_warriors_season_1_episode_2.pdfIn PDF document text
    • https://cdn.sqhk.co/kipezipilojo/tghfrie/raxezodarilurezimafago.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479237/normal_5fb82be65ef30.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/woxorojero/miwelawesorubeferefavedix.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_off0000ddcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCB 5000 bytes
SHA-256: a5fc4935d22e9852bbad77e4692a700c053d2a50b2d4fc365bca5aff5cf70fcf
font_01_sfnt_off0000eec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC6 10696 bytes
SHA-256: 0163e3a987478c519265a5aa4411f2266bcbe8e023c5ea025f679f94f94b3098

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