Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb5d3d3f1de64ea…

MALICIOUS

PDF

101.4 KB Created: 2021-03-14 10:44:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6d30fbbca2d4ab6f8e635391b86ef9f4 SHA-1: 37e6b3598602f46fc2b5cc6c4ebaec86151089e6 SHA-256: 4fb5d3d3f1de64ea4af395be1d16acb441a551b3af089c9c7653df44d7a8b4de
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, including one that appears to be a redirector for a link farm, and another that is part of a potential phishing lure. The presence of external URIs and the overall structure suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/wix?keyword=sine+rule+worksheet+pdf PDF link annotation
    • http://avtovishki-msk.ru/258052610348avcw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445881/normal_6048a2218897c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368225/normal_60089dba3b6ee.pdfIn PDF document text
    • http://goldenframecollision.com/boston_market_chicken_soup_caloriesaou0r.pdfIn PDF document text
    • http://sodahq.club/whirlpool_energy_star_70-pint_dehumidifier_with_pump_costcoehcpx.pdfIn PDF document text
    • https://cdn.sqhk.co/mobubivifa/ggjjGji/duck_hunt_dog_laugh_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/rorezina/j1hcBkm/turbo_driving_racing_3d_download_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471091/normal_5fddc0368a7af.pdfIn PDF document text
    • https://mujaxelixoduren.weebly.com/uploads/1/3/3/9/133997177/f38ee0.pdfIn PDF document text
    • http://bometaximom.scienceontheweb.net/74935229911.pdfIn PDF document text
    • https://vebaruroximowut.weebly.com/uploads/1/3/4/3/134342498/e008c.pdfIn PDF document text
    • https://cdn.sqhk.co/vefemenivu/dgdep1e/top_10_games_list_maker.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/cIheZIN/sitapisiwoleb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384039/normal_60178473a70ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393625/normal_602b73efd795c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zulolabopel.myartsonline.com/berliner_platz_3_neu_glossar_griechisch.pdfIn PDF document text
    • http://xuxalonitu.onlinewebshop.net/24880626963.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000136df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DF 5060 bytes
SHA-256: 211e91e7512a86b06c70fb946c9b0e73f0d3f00f999b0a778adbe80aab5a2fdc
font_01_sfnt_off00014810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14810 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0001509e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1509E 12116 bytes
SHA-256: 96823992e55f7448ed343ceece334808217b3a9dd53cf8ef89a86394d0b113de
font_03_sfnt_off000179e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179E5 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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