Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f5223e2798fa51…

MALICIOUS

PDF

78.5 KB Created: 2021-02-01 09:42:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1c3af6de1bdcd0ad3c71edb33d59870d SHA-1: 6e6550314f9704e75205e3e05732bb7b50ecb56d SHA-256: f7f5223e2798fa5191684f2dc00c1dffee1c03f254eb5283563db40f5162d189
184 Risk Score

Malware Insights

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

The PDF contains numerous links, with at least one pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to movie search terms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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://yafferge.ru/aws?utm_term=korean+action+movies+with+english+subtitles In PDF document text
    • http://xofajenakimexo.iblogger.org/gateway_workbook_answers.pdfIn PDF document text
    • http://gufutaca5.xyz/wreck_it_ralph_theme_rush_tiles_magic_hopperulcbi.pdfIn PDF document text
    • https://soguleta.weebly.com/uploads/1/3/4/3/134305846/gikimiri-wosexigisero-sabaxaga-bapolo.pdfIn PDF document text
    • http://ipoteka.net/age_of_empires_2_hd_multiplayer_crackeeanx.pdfIn PDF document text
    • https://jokasagumejede.weebly.com/uploads/1/3/1/0/131070006/1984183.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452199/normal_6004694d0e697.pdfIn PDF document text
    • https://xesudubivutomu.weebly.com/uploads/1/3/5/3/135303490/1990754.pdfIn PDF document text
    • https://pivisagut.weebly.com/uploads/1/3/2/8/132815367/5498519.pdfIn PDF document text
    • https://lexojonogi.weebly.com/uploads/1/3/4/3/134315697/kepupex.pdfIn PDF document text
    • https://nolutoxut.weebly.com/uploads/1/3/4/6/134683805/ziniwezemanuge.pdfIn PDF document text
    • https://wefapewirevuvik.weebly.com/uploads/1/3/4/6/134667644/sadunomunexoju_lipabakow_gunepavodevemal.pdfIn PDF document text
    • https://sajolunuweto.weebly.com/uploads/1/3/1/4/131407571/pujujerilode.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450140/normal_60081dd1791f7.pdfIn PDF document text
    • https://tepogixe.weebly.com/uploads/1/3/1/4/131437844/wekusefotuvuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jukikusikodopom.epizy.com/advanced_java_tutorial_free.pdfIn PDF document text
    • http://putesedesupelo.epizy.com/us_business_visa_invitation_letter_template.pdfIn PDF document text
    • http://tefinavi.epizy.com/crossword_quiz_answers_movies_level_4.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_off0000f653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 5472 bytes
SHA-256: 26c9e61d1136b9132e36eaae518b4e28a5d1e1485d6997669df5a2ec429ef24b
font_01_sfnt_off000108df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DF 10328 bytes
SHA-256: 9e1b537bc01ad47d3ad3b4121e34a6b396839abd52cd91b745bf5bee8f8133e8

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