Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b977a305f69c22…

MALICIOUS

PDF

71.8 KB Created: 2021-02-15 07:05:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8dfd9474221683e2c1b0883f85844c08 SHA-1: 36aa4997710a06fdf01bc79488ea5788093b7aeb SHA-256: 01b977a305f69c22a48c7f0c0b6f1b09fded7cc4c5d6434d6e06fcc236d3c0c8
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the heuristic indicating a link farm strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=timex+nature+sounds+alarm+clock+t1201+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387565/normal_5fdbd108963db.pdfIn PDF document text
    • http://mebets.xyz/zaxivexoxomuxadez0r319.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/ar4YhaN/xuvuvuwamusi.pdfIn PDF document text
    • http://salonop.xyz/zileruferubuvidimafiwigikqbud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503309/normal_602540fad256e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457861/normal_5fd72b1ee3362.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421943/normal_5ff941a0c711e.pdfIn PDF document text
    • https://cdn.sqhk.co/feletitami/jihdjiq/direct_flights_to_hawaii_from_slc.pdfIn PDF document text
    • https://cdn.sqhk.co/linewebozid/nAHnjac/11486008893.pdfIn PDF document text
    • https://cdn.sqhk.co/gujamozulas/Ugfidfs/72698080587.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/gi9ih7b/more_mutant_creatures_mod_mcpe.pdfIn PDF document text
    • https://cdn.sqhk.co/tezikegoj/Hjdhdja/jajofubajiketalamabelej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461495/normal_60064b60f19de.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/Pjh8Yie/23928716986.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456114/normal_60206cdfd6806.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468537/normal_5fec58199a003.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502817/normal_5fec6935acfc2.pdfIn PDF document text
    • https://cdn.sqhk.co/fegibowaxus/fibhdge/offroad_outlaws_money_glitch_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/jejfOhf/12976940473.pdfIn PDF document text
    • http://milansit.space/961734600655jfkr.pdfIn PDF document text
    • http://lishop.site/208057030023878x.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/bogeguva/java_8_mac_os.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_off0000da46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA46 5492 bytes
SHA-256: 6ee35c3274e09ec21ca7dc81cf68f70a998dd14ed63fd4f51c44b7f189b5c92b
font_01_sfnt_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 10704 bytes
SHA-256: f7e3818d5f13eea41cc0e729d70201fc39f798a4dc230b60d464d60dd9843752

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