Malicious PDF — malware analysis report

Static analysis result for SHA-256 085592d525880b17…

MALICIOUS

PDF

73.3 KB Created: 2021-03-15 23:46:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 651b9836153e3fd0a9d44c828b43e2e0 SHA-1: adf4b1411bebc8f99746ef5fd7a49214cfc6b96c SHA-256: 085592d525880b17732e9ee1da349c1c66f52f172544c7b6b56d89e587910101
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to link farms and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a download link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://seumenha.ru/wix?keyword=almost+adulting+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/nobixapo/6hg7Aie/33603220459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457563/normal_602803c7591af.pdfIn PDF document text
    • https://xilemuje.weebly.com/uploads/1/3/4/2/134265988/2904831.pdfIn PDF document text
    • https://pobanofesu.weebly.com/uploads/1/3/1/3/131398475/d2bda068.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/EjaiaTU/text_twist_free_online_gamehouse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470537/normal_602ac4f13e029.pdfIn PDF document text
    • http://sanezukevuzav.iblogger.org/kipimu.pdfIn PDF document text
    • https://zotujovub.weebly.com/uploads/1/3/4/3/134354671/005593.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/15Hojhn/ridodejok.pdfIn PDF document text
    • https://kisujaxu.weebly.com/uploads/1/3/0/7/130775962/vazotobi-megun-fibomanakamon-tunazazaraler.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417045/normal_600a0cbc34087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415052/normal_5fd779408e42d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368750/normal_60469dab3b380.pdfIn PDF document text
    • https://ronenajawewaxiw.weebly.com/uploads/1/3/4/5/134594127/c588307dd7.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/IOIhaib/nosesinuki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451353/normal_60126a3a17a54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nefagolom/74166315497.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/kh2_anti_form_trophy.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/makatovenegu.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/why_are_oceanic_gyres_not_symmetrical.pdfIn PDF document text
    • http://lidekajemunow.epizy.com/bhojpuri_song_2019_video_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/47465209334.pdfIn PDF document text
    • http://lifimakapusijok.rf.gd/10100079410.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_off0000e0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0ED 5444 bytes
SHA-256: 82307f6b34307f10d72d0e7bd78b21304d6546d5ad20dcedcfdd02247d44a7dc
font_01_sfnt_off0000f36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36C 10684 bytes
SHA-256: 2d8a376df1be00b5003321374e40acf16423b7583e94b85970f5530c0a5fd5cb

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