Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c66c90ee481622…

MALICIOUS

PDF

74.2 KB Created: 2021-02-23 01:06:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 92da99c0f15d2b9de3c5a457009213f2 SHA-1: ed784aaa8e9e04119f04008dcba265983b1abc62 SHA-256: a1c66c90ee48162280759854b9c09c360a30d79c2ab2e94bf723c68a581fae6f
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the document as a link farm on disposable hosting, reinforcing the malicious nature of the URLs.

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://bologen.ru/aws?utm_term=utilitech+2+outlet+timer+instructions PDF link annotation
    • https://cdn.sqhk.co/vokalater/hjgjD0g/cinemark_theaters_stock_price.pdfIn PDF document text
    • https://cdn.sqhk.co/someteku/SigZieN/mokafodugonudodisejemafup.pdfIn PDF document text
    • https://cdn.sqhk.co/kofelejezem/H9vifjc/70695073111.pdfIn PDF document text
    • http://rating-bookmaker.ru/843755627181qd2w.pdfIn PDF document text
    • http://ruszaimclub.ru/gujopofukolobuxizadju5h8.pdfIn PDF document text
    • http://czecheducation.space/50719930435lguzz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470232/normal_5fc7dd6147577.pdfIn PDF document text
    • https://cdn.sqhk.co/gewanunu/jfjeihx/fuwemizanazinatimepu.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/ZohbQif/38058487931.pdfIn PDF document text
    • http://getplafond.xyz/392945039849900f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448731/normal_5fcc5a11b1643.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuviju/hdjjhgf/bangdeals_lite_offers_deals_for_banggoods._com.pdfIn PDF document text
    • http://goromeo.club/kenwood_ddx672bh_resetdpxiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426063/normal_5fd858db3b99f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414688/normal_5fd23a0dc5a44.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kaxogesidod.epizy.com/bejobabubibap.pdfIn PDF document text
    • http://favigagiwu.epizy.com/background_png_images_for_android_app.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_off0000e3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B6 4952 bytes
SHA-256: 3037f7c53c99ac51e21c5ab1cde7c017efcef037da9f7067547abd06253d5ee1
font_01_sfnt_off0000f46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 11456 bytes
SHA-256: 0a977714b1de5466801bbfa0fbe3065d2b905bbbd07134523f58f74d1f8a3e88

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