Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6a7497aa0da839…

MALICIOUS

PDF

150.8 KB Created: 2021-05-03 23:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4132dcef2a8e3d4cda41f9b9a8ab2332 SHA-1: 7e32a5b8124c5df1b27332afb3e3224a8cd7b4a4 SHA-256: dc6a7497aa0da839eed6c38ee3e5a5000c38298b5467e2d9145c743057073d26
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The document body contains a lure related to 'spinoza audiobook' and numerous embedded URLs, many hosted on disposable domains, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/strik?utm_term=looking+for+spinoza+audiobook In PDF document text
    • http://liniwugo.iblogger.org/jedumepu.pdfIn PDF document text
    • https://cdn.sqhk.co/kapimetavis/V6QhhhD/70559864536.pdfIn PDF document text
    • https://cdn.sqhk.co/titesojijuko/ifcNhd8/15127648775.pdfIn PDF document text
    • http://lasns.fun/69500762291f5vbc.pdfIn PDF document text
    • https://cdn.sqhk.co/kerosumumato/tgdgdTV/escape_the_mansion_minecraft.pdfIn PDF document text
    • http://cosmicgig.com/footswitch_per_fender_champion_40hz4lv.pdfIn PDF document text
    • http://mesretly.xyz/stanley_450_amp_jump_start_system_with_compressor_manuala043f.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/Nighigh/download_blocky_highway_mod_apk_home.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://cdn.sqhk.co/zepigelona/eFgiCrW/free_faith_based_movies_on_amazon_prime.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/cchhhhi/baby_alive_grows_up_happy_doll.pdfIn PDF document text
    • https://cdn.sqhk.co/zoribakim/thhgfKu/ajax_json_file.pdfIn PDF document text
    • http://cashbackk.site/age_of_the_rebellion_battlefront_2_supremacyiqmx3.pdfIn PDF document text
    • https://cdn.sqhk.co/daposofoxig/hgXNtES/24306884181.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/9jazjik/wujupijefuzepipuf.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/xalexojaxipud/98881956136.pdfIn PDF document text
    • http://vubenotabajumem.epizy.com/what_does_yo_tambien_te_amo_mean.pdfIn PDF document text
    • http://liraderivuw.epizy.com/cambridge_english_advanced_speaking.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/juripebivugaz.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/kabariterivusudimolaber.pdfIn PDF document text
    • http://lizuratudesaxop.epizy.com/renounce_us_citizenship_form_8854.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/84329328066.pdfIn PDF document text
    • http://lujokasavem.rf.gd/5288816021.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_off00020a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20A73 5372 bytes
SHA-256: acba4ae8612102268c6d3bcc834adc14da6b1d3f4554c1c0e97bf15d04871f22
font_01_sfnt_off00021cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21CDB 15768 bytes
SHA-256: 918aae236fb154a2171c5b4b12e64fa5b047213a54fd7599fb9c1a21a26b6c67

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