Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35e0b6aad308780…

MALICIOUS

PDF

69.9 KB Created: 2021-02-16 05:17:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a63e0667c4eb620f96e2cf6fa3b95ece SHA-1: da8eca972750ce354b43190ccb92f967a2296315 SHA-256: e35e0b6aad3087802f2655a56ce53b1b824cecced258c0c607613d2599dcbcc3
126 Risk Score

Malware Insights

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

The PDF contains multiple external URLs, with one specifically linked to a lure about 'best philosophy of science textbooks'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a malicious intent to redirect users. ClamAV detection and ML classification strongly indicate this PDF is malicious, likely a phishing or malware distribution attempt.

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
  • 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://jottigo.ru/123?utm_term=best+philosophy+of+science+textbooks PDF link annotation
    • https://wezisaveveto.weebly.com/uploads/1/3/3/9/133999444/midimudexisapuso.pdfIn PDF document text
    • https://cdn.sqhk.co/pidodalatip/imdigJn/the_eagles_complete_greatest_hits_vinyl.pdfIn PDF document text
    • http://videohost.space/escape_planet_earth_characters2zmax.pdfIn PDF document text
    • http://prizinsta365.website/potabikofajofopinitibure77e24.pdfIn PDF document text
    • http://berkeciftci.net/football_manager_2019_league_rankingsru93v.pdfIn PDF document text
    • https://kevititexozasen.weebly.com/uploads/1/3/2/7/132712545/sokatubogop-podifi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486061/normal_5fcf2f5b2b436.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/giehaWL/chickens_for_sale_in_east_texas.pdfIn PDF document text
    • http://kpovli.ru/lonerism_hoodie_for_saleqznk5.pdfIn PDF document text
    • http://boevoenlp.com/20552518057wq9bi.pdfIn PDF document text
    • https://visofamawuri.weebly.com/uploads/1/3/2/3/132303269/4816985.pdfIn PDF document text
    • https://cdn.sqhk.co/fakodozug/hUgjiDQ/movistar_plus_apple_tv_2020.pdfIn PDF document text
    • http://presalle.xyz/que_significa_redencion_segun_la_bibliaknm6d.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/nafibanefexex/31839348356.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/52726391984.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/vuginoperubagenuj.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/android_sdk_fastboot-_adb._zip.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_off0000d4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FE 5220 bytes
SHA-256: 3cff4749b2eb91484992f1ddbc15a6ff021a6114777ed32e46bfe67166462e99
font_01_sfnt_off0000e6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 10324 bytes
SHA-256: 16db8f9bbccf3e3ad6f70276fac5929c0e04f25663d006032359af8064f47d5b

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