Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd05597bb9693359…

MALICIOUS

PDF

84.5 KB Created: 2021-02-18 19:05:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b33ab6218f557103f163308791cd1f9f SHA-1: 661b4ae880df6f995e7d00d04a8db4d1fa952c01 SHA-256: cd05597bb969335969f2aa54ee40cb26d684d3cf068cfccdc41f94511a072c72
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on disposable hosting further supports a phishing or malware distribution scheme.

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
  • 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://yafferge.ru/wix?keyword=pathfinder+battle+of+bloodmarch+hill+pdf In PDF document text
    • http://it50discount.pro/jiromazasulojefidic0vbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411686/normal_601e5c1393755.pdfIn PDF document text
    • http://filfex.ru/ayo_e_teo_rolex_instrumentalg9m7t.pdfIn PDF document text
    • https://cdn.sqhk.co/ratobomebal/rCzgdQq/premier_league_top_scorers_2020_21_season.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/fuggcZO/lunar_battlegrounds_moon.pdfIn PDF document text
    • https://cdn.sqhk.co/bamikalagov/hjjjjDP/papezubi.pdfIn PDF document text
    • http://uuuuull.space/fr_leavis_the_great_traditionzaypl.pdfIn PDF document text
    • https://cdn.sqhk.co/fejipotegevi/hi3hdgg/5244898010.pdfIn PDF document text
    • http://fashion-deals.xyz/gelikisuwafojujidofisefjvv.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/sO4gNji/74225223560.pdfIn PDF document text
    • http://bidurevemoj.22web.org/43562782928.pdfIn PDF document text
    • http://dexowowijovovu.iblogger.org/mathematics_syllabus_for_jhs_2012.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jarebavax.epizy.com/pamofovoralimude.pdfIn PDF document text
    • http://lojifasipok.rf.gd/bootstrap_form-_control_text_box_width.pdfIn PDF document text
    • http://zovitox.epizy.com/vokabamuwalagezeked.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10222 5148 bytes
SHA-256: b54d07e92063fc8e73cdc0e0c49ef8bc81a33b7f2532c43ba3f2c31262a4268a
font_01_sfnt_off0001135d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135D 10208 bytes
SHA-256: ef0eed5dda8554b491aca9f771bed2a85250bcc9367511a224616f2f40d5947c
font_02_sfnt_off00013653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13653 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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