Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b4f562e9edf15c…

MALICIOUS

PDF

77.8 KB Created: 2021-02-17 09:37:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a04d301d6b737c0ef93867dbd5efe15d SHA-1: d57981cad5cbe0d69a8fc116887408b48bd8b5c1 SHA-256: 42b4f562e9edf15c93a4d3759fa48f9a6da4092208b330913f4a18683cab4aa0
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to suspicious domains, many of which are flagged as redirectors or hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=active+root+apk+download+2020 In PDF document text
    • http://xikumidevulofo.iblogger.org/rolling_action_items_list_template_excel.pdfIn PDF document text
    • http://bunnygummy.ru/ipcc_2007_report_himalayan_glaciers_meltingvdmmo.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/UtjeDJO/risanadekilusa.pdfIn PDF document text
    • http://senteber.site/vocabulary_builder_activity_an_urban_society7dehu.pdfIn PDF document text
    • http://easylearning.space/2406433630318bix.pdfIn PDF document text
    • https://wumifidadorubip.weebly.com/uploads/1/3/5/2/135298964/nugiguj.pdfIn PDF document text
    • http://itfamily.info/marvel_stadium_parking_promo_codevyaon.pdfIn PDF document text
    • https://mufewikusa.weebly.com/uploads/1/3/4/0/134042586/gatosifibevava-funubibam-zixegumoxiseke.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/80khfJF/58283891331.pdfIn PDF document text
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/jadopowo.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://taxisariwoboduz.epizy.com/serie_chernobyl_hbo_legendado.pdfIn PDF document text
    • http://nimukefamax.rf.gd/wing_chun_wooden_dummy_techniques.pdfIn PDF document text
    • http://debagejusuwaj.epizy.com/bing_wallpaper_pack.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_off0000e72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72D 5156 bytes
SHA-256: 6510b4badf18dfc6ec12a6f73a60170120bcb8e8b7ec6147f22c1ac0884f876e
font_01_sfnt_off0000f8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 10412 bytes
SHA-256: a85a3a6cb01152678a8d370dd1be1610908ee6e5da0d8a6be85c787daf0449bc
font_02_sfnt_off00011c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C93 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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