Malicious PDF — malware analysis report

Static analysis result for SHA-256 3640125ffd69c832…

MALICIOUS

PDF

73.3 KB Created: 2021-01-20 10:55:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8ea92668726b1283d4a4b07d4700c9f2 SHA-1: dcb0e2f1a4faa690498fa3d0804a8f557dfa22a4 SHA-256: 3640125ffd69c8326f47c63e9534997725e4263aeb4baa6404c34b7991cdd2eb
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or known redirectors, indicating a link farm designed to distribute malicious content or phish for credentials. The presence of 'Paypal classic site uk' in the document body and URL suggests a phishing lure related to financial services. ClamAV and ML classifiers also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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/123?utm_term=paypal+classic+site+uk In PDF document text
    • https://cdn.sqhk.co/letijefa/pmNjbQt/diy_wood_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/fematixub/iRqpNgj/26037523274.pdfIn PDF document text
    • https://zibekasosux.weebly.com/uploads/1/3/4/0/134040395/9509930.pdfIn PDF document text
    • https://zutujoxiker.weebly.com/uploads/1/3/0/7/130776667/129b70cc0b6b.pdfIn PDF document text
    • https://cdn.sqhk.co/lenawemijixe/gc9iaDl/nika_riots_justinian.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/1EQdgjq/sheet_yourself_for_rpg_apk.pdfIn PDF document text
    • https://goxanakevixi.weebly.com/uploads/1/3/4/8/134857001/bifodigas-jukafijix-xabezoj-fomeduse.pdfIn PDF document text
    • https://juwaxevepatasi.weebly.com/uploads/1/3/0/8/130874094/e52ca54.pdfIn PDF document text
    • https://suxosuliresud.weebly.com/uploads/1/3/5/3/135351283/ce47d059fca5d29.pdfIn PDF document text
    • https://cdn.sqhk.co/milevatomog/igih7kA/sort_it_3d_app.pdfIn PDF document text
    • https://cdn.sqhk.co/mojupesonon/hbhjGTc/14708901871.pdfIn PDF document text
    • https://site-1168274.mozfiles.com/files/1168274/megabigunigiwawoluwik.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/befarekogol/celtic_voyage_flute_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/offer_rescinded_template.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/fannie_mae_and_freddie_mac_foreclosure_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/7th_grade_math_problems_with_answers_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/acting_up_g_eazy.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_off0000df93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF93 4996 bytes
SHA-256: 55c175b33d16c736c96467295307cd75aa100e0ba007d5e74d6f002a1503b102
font_01_sfnt_off0000f0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B3 11896 bytes
SHA-256: 280d24f4ec236a9ee9c2aa67fd73b690cb3fd529aeb8e5e26b336c581a00d9e4

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