Malicious PDF — malware analysis report

Static analysis result for SHA-256 634dce98ff37f5ad…

MALICIOUS

PDF

81.3 KB Created: 2021-02-21 15:49:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a7c90fb8df5848faa395be1cc9884094 SHA-1: 11874a8dd195d9d401b909ebeda8317efe26943d SHA-256: 634dce98ff37f5ad7e456bedb2d34f303bd2babd9df93a5e7a2381ebd51b12b3
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and embedded links suggest a phishing or scam attempt designed to lead users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://crophysi.ru/aws?utm_term=how+to+determine+angle+measures In PDF document text
    • https://cdn.sqhk.co/xibumediw/jgjbLgh/target_toy_cars_to_drive.pdfIn PDF document text
    • http://dreabling.online/astm_e83hhypd.pdfIn PDF document text
    • https://cdn.sqhk.co/loxusovi/gfgiVid/69909569820.pdfIn PDF document text
    • http://lesagotefawa.22web.org/nizamoled.pdfIn PDF document text
    • https://cdn.sqhk.co/dunokufimove/jiiDFgk/vertigo_cure_treatment.pdfIn PDF document text
    • https://cdn.sqhk.co/nixafusoda/rkiahbW/pugolonimujejaxil.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/hfenhc6/karuvonesasowimoferutizo.pdfIn PDF document text
    • http://cosmosqrab.online/vujekasatopizoperuw7aqve.pdfIn PDF document text
    • http://magnifioco.site/zawivotamknno2.pdfIn PDF document text
    • https://cdn.sqhk.co/wularumijif/FihBgfW/24780118233.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/fBp9SaT/riverside_drive_macon_ga_restaurants.pdfIn PDF document text
    • http://fineagencyy.com/sharp_carousel_microwave_reviewsgztnh.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://pejefovad.epizy.com/68031465110.pdfIn PDF document text
    • http://jefuxod.epizy.com/miniclip_games_for_pc_bubble_trouble.pdfIn PDF document text
    • http://fikirifulok.epizy.com/naripifonisuga.pdfIn PDF document text
    • http://gurunetotej.rf.gd/56376553443.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_off0000f197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF197 5080 bytes
SHA-256: a19d0487f057d49d181e4c83b02c9de9e4cd65a9c46f6cf69ee35d6d71706592
font_01_sfnt_off000102ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CA 11496 bytes
SHA-256: 3f4b5273c855b6fbf3364d8f33f3d5ee517b7c357a08b1ac8eab28a67ca15bd1
font_02_sfnt_off000129d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D4 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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