Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f366b4be7d13aab…

MALICIOUS

PDF

147.6 KB Created: 2021-01-14 17:47:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c20a394657d794878b960b28a13fb8c9 SHA-1: b2ba13dd6ba39c7a87c1477e683aab420ce07296 SHA-256: 4f366b4be7d13aab1a358fdbfe804bd43ae52b0e5b7ba7bc003f6f95f71d68c9
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document body, though heavily obfuscated, suggests a lure related to a 'Maytag washing machine service manual'. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted from this sample, but the overall structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://traffnew.ru/123?utm_term=maytag+washing+machine+service+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424341/normal_5fb5928d29d5f.pdfIn PDF document text
    • https://site-1166704.mozfiles.com/files/1166704/1spotmedia_app_download_for_pc.pdfIn PDF document text
    • https://kafigibedup.weebly.com/uploads/1/3/4/4/134479504/lilisavawelanakedo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389376/normal_5fffff854fe59.pdfIn PDF document text
    • https://fogolimavoburaj.weebly.com/uploads/1/3/0/8/130813413/2622697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488810/normal_5fb944b2aa5b7.pdfIn PDF document text
    • https://site-1199794.mozfiles.com/files/1199794/xorakakimakovoratade.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476952/normal_5fed0eeaf11f4.pdfIn PDF document text
    • https://site-1171599.mozfiles.com/files/1171599/the_big_apple_abbr_crossword_clue.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_5f8c8f2d03fe2.pdfIn PDF document text
    • https://cdn.sqhk.co/voduzetefir/jfihhgr/all_zombie_killing_simulator_codes.pdfIn PDF document text
    • https://site-1174289.mozfiles.com/files/1174289/keporewulujalanunovo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385228/normal_5fd3563ea7f07.pdfIn PDF document text
    • https://cdn.sqhk.co/mibajufaneja/ILgehek/67631430596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382405/normal_5f923c526c4e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5fdaa93dcb63a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000208e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x208E2 5472 bytes
SHA-256: b4b133aa97e938b60185504cd65a6574a4cb5fbc9a76b18b6218dabfb49a16a9
font_01_sfnt_off00021b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B81 10528 bytes
SHA-256: 9e7722ea64c8146dbd16659f0d67aed9a1d80164d9563c8e18a1040d59412c2b

Open this report in the interactive analyzer, or submit your own file for analysis.