Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45f6a30c1586e98…

MALICIOUS

PDF

71.1 KB Created: 2021-04-10 14:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 13db9cca293999f495c16c9cfa923738 SHA-1: a3f3ace55bf940cf8f2d2c7c0575493d8cf648eb SHA-256: b45f6a30c1586e98c08aac0abc59a40bd368cf5ad1e9926a03ee31c2241f60ce
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirectors or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of many links and the heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' points towards a phishing or drive-by download attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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 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://crophysi.ru/strik?utm_term=ham+radio+deluxe+support+forums In PDF document text
    • https://tazusovekofuwaj.weebly.com/uploads/1/3/5/9/135969448/lidekopis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477864/normal_60611b196dd68.pdfIn PDF document text
    • http://salleapp.xyz/what_is_movement_in_graphic_design10c9s.pdfIn PDF document text
    • http://bonifacy.site/sherlock_holmes_stories_order_of_publicationjpl0e.pdfIn PDF document text
    • http://upsbox.ru/guvilevox0mt4.pdfIn PDF document text
    • https://cdn.sqhk.co/malofavu/5v2Z9CJ/limbo_significado_espanol.pdfIn PDF document text
    • https://zunodeni.weebly.com/uploads/1/3/1/0/131070331/vapowaj.pdfIn PDF document text
    • http://svarka-aurora.online/18774271763oczbr.pdfIn PDF document text
    • https://cdn.sqhk.co/zofonabiz/ihHgija/tabadoja.pdfIn PDF document text
    • https://wevobuge.weebly.com/uploads/1/3/5/9/135978380/9cddb573466.pdfIn PDF document text
    • https://cdn.sqhk.co/noligigibar/cmhamjc/56114330338.pdfIn PDF document text
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/3900830.pdfIn PDF document text
    • http://lajalura.22web.org/claves_radiales_bomberos_de_chile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418170/normal_603d1a452fa1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375503/normal_6068cfe17ef56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445573/normal_5fe1a70bd8d39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488558/normal_60323d9873b55.pdfIn PDF document text
    • http://centerverifybadge.com/lg_wireless_headphones_not_connectingnu7u6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vesalege.epizy.com/zonugunixolip.pdfIn PDF document text
    • http://kafopazam.epizy.com/86225291182.pdfIn PDF document text
    • http://mavuginogafesu.epizy.com/fuguwapelukupovesub.pdfIn PDF document text
    • http://rozevilamires.rf.gd/ap_agriculture_budget_2020_20_in_telugu.pdfIn PDF document text
    • http://zatozegajuzu.epizy.com/latest_bollywood_movie_mp4_song_free.pdfIn PDF document text
    • http://mopezit.epizy.com/install_asciidoctor-_mac.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_off0000d9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 5216 bytes
SHA-256: 4adafaab113dc101ece21439b6979b502821fb256ad400aad7243ed41b85f9d6
font_01_sfnt_off0000eb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 10388 bytes
SHA-256: 98bd27e14e4e615a94066f4f5720e935c2cefd5cc3cd2d283fd689a2631af069

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