Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c7faffc73c2148…

MALICIOUS

PDF

74.8 KB Created: 2021-01-25 00:42:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ad1b9ec8f88e6cd648543fae86ebf60c SHA-1: 5027781bc1a081beae0b67fabc31bae36c0e17df SHA-256: 53c7faffc73c214859e1b395debc7a46e4d4d176657a09d54f265c447f88a2f5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which point to disposable domains and are likely used for phishing or to host further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/123?utm_term=clean+slate+cookbook+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460983/normal_5fcf7e325b34e.pdfIn PDF document text
    • http://shopmzm.site/27273261571g7dzn.pdfIn PDF document text
    • http://it50life.pro/download_drag_sim_2018_mod_apklb98z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477921/normal_5fea168d728af.pdfIn PDF document text
    • http://stickerrus.ru/should_roommates_share_renters_insurance8051s.pdfIn PDF document text
    • http://ogranicbio.space/bukibutybmqw.pdfIn PDF document text
    • http://zespodsvetkoy.site/neo_lms_login_university_of_san_agustine1kpc.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/49395928732o3mgt.pdfIn PDF document text
    • http://serdyukov.pro/kekoxuwqzg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407724/normal_5fe8bcda9407f.pdfIn PDF document text
    • http://tufidifegoz.66ghz.com/float_glass_sheets_for_sale.pdfIn PDF document text
    • http://testvvd.xyz/kamisea9gpj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xubudexev.epizy.com/24764564165.pdfIn PDF document text
    • http://jabowedufup.epizy.com/41909954158.pdfIn PDF document text
    • http://rugeritubaduw.epizy.com/rupinder_gandhi_2_songs_djjohal.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_off0000e638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE638 5164 bytes
SHA-256: c41a5f42e2162bea874c3da83f0abac97dbb7baaa7ce052f52954622ee908932
font_01_sfnt_off0000f7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 11220 bytes
SHA-256: 91b0c7bb237e039c97de6aa4dc478a0a0c683dd77ab1247afea607afd689225f

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