Malicious PDF — malware analysis report

Static analysis result for SHA-256 727555d4e60d55eb…

MALICIOUS

PDF

73.3 KB Created: 2021-02-28 15:27:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 00034d4da7f7e73f61d1b3ce7845a180 SHA-1: 56be60210bdf4c12c8212c19834212bb860dc8c7 SHA-256: 727555d4e60d55eb655879c4fa30dc7ea0380155f270e91b31ce9e785027a1e5
284 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are hosted on disposable domains or known redirectors. The heuristic firings indicate a link farm designed to distribute malicious content, likely phishing pages or malware downloads. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=how%20to%20refill%20staples%20in%20swingline%20heavy%20duty%20stapler In PDF document text
    • https://kirorasonosa.weebly.com/uploads/1/3/4/7/134743937/b06fa3069f59.pdfIn PDF document text
    • http://lifegirls.site/dapusogajudesobewamezujabbtfow.pdfIn PDF document text
    • http://busivel.xyz/sikuze4j6h2.pdfIn PDF document text
    • https://xivogere.weebly.com/uploads/1/3/0/9/130969247/vovos_zelopikaluf_wadex_rorenomenaniz.pdfIn PDF document text
    • http://farvestnn.ru/gevipobebotuxirewumoxyk5a.pdfIn PDF document text
    • https://jesidovelagira.weebly.com/uploads/1/3/4/7/134705211/1d18b.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/kilumelezeluzipogipelul.pdfIn PDF document text
    • https://tudadakamoziv.weebly.com/uploads/1/3/4/5/134596668/553b30f4b2afffc.pdfIn PDF document text
    • https://wudowured.weebly.com/uploads/1/3/0/8/130873715/8c8c2.pdfIn PDF document text
    • http://scarcebook.com/pycharm_ipynb_convert_to_python_scriptf5yko.pdfIn PDF document text
    • http://worldhold.online/38186450410erwjf.pdfIn PDF document text
    • http://rusakova.space/606380509212aa0i.pdfIn PDF document text
    • http://bigchance.pw/buwonezusaredatabi2ixl9.pdfIn PDF document text
    • http://top-shop-store.website/jekagepifs20f.pdfIn PDF document text
    • https://cdn.sqhk.co/rekubapapup/japMji6/jolted_definition_in_spanish.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dfae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAE 5520 bytes
SHA-256: 826f74e03d40b265a00e6ec1b77e510c887174b691c8ece02351e904d3ecf96f
font_01_sfnt_off0000f284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF284 10328 bytes
SHA-256: fa1c51898ef96d23c45ddce03ccdf3a70d4577b505ea30a68936a9e43945b816

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