Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18b182141766baa…

MALICIOUS

PDF

72.4 KB Created: 2021-01-14 21:48:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ec47f7ba39287d23e81df0b6287c301b SHA-1: d6094720ffae7f9911d33d057c988a0c4ac4cedf SHA-256: b18b182141766baa6515ad53e5dbb830ad2b3ccbb06dc9c51abc3aba47ba05a6
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm designed to drive traffic to malicious sites. The presence of a URL related to 'worms 3 apk' and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution attempt. No scripts were extracted, but the primary attack pattern involves luring users to external, potentially malicious, web content.

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://ggtraff.ru/123?utm_term=descargar+worms+3+apk In PDF document text
    • https://cdn.sqhk.co/javeduner/IK5hhie/free_online_antivirus_scanner_for_mac.pdfIn PDF document text
    • https://funosojo.weebly.com/uploads/1/3/5/3/135336125/vazowubu.pdfIn PDF document text
    • https://betisifi.weebly.com/uploads/1/3/1/4/131438474/zamojewik.pdfIn PDF document text
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/vanege_pazakanem_ralogesoda_gekolevidi.pdfIn PDF document text
    • https://jivenikovo.weebly.com/uploads/1/3/4/3/134308789/teluruviguxut_dugotosalewov_dizekuroganawe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423780/normal_5fdbe84a40b9e.pdfIn PDF document text
    • https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/3877077.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423431/normal_5f9c9bc2d925c.pdfIn PDF document text
    • https://cdn.sqhk.co/kikutajaz/ibCjjwK/facebook_login_sign_in_mobile_number_and_password.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457843/normal_5ff4faff45352.pdfIn PDF document text
    • https://site-1244778.mozfiles.com/files/1244778/html_colour_codes_list.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/veraxawewib/gift_guide_persona_5.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_off0000dd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1E 5540 bytes
SHA-256: efff7985441012aa20413ba862eddd2b106506aab74a68bf98cbb2698824e0c6
font_01_sfnt_off0000f003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 11196 bytes
SHA-256: 8a619248a6763deeb27153770a50f6e3683d5d3056af9d30896619aab6ade910

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