Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e35180cc284e56…

MALICIOUS

PDF

105.6 KB Created: 2021-02-23 13:53:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: de58b4f1d4ae44d66417b70edc3291ab SHA-1: 5db2f42a9200291ca2bed5a3210e2318250b9653 SHA-256: d4e35180cc284e565d32ff3cc5959755d8972e77be6c38ec038994a39214ea97
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URIs suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://druttle.ru/strik?utm_term=mini+mental+state+examination+pdf+uk PDF link annotation
    • http://kupuzuzopojesu.22web.org/medisegu.pdfIn PDF document text
    • https://cdn.sqhk.co/daxegajok/hcJlEU8/sticker_among_us_english_wastickerapps._com.pdfIn PDF document text
    • https://cdn.sqhk.co/ledivure/gdhUgc3/sivubefimefekaw.pdfIn PDF document text
    • http://blacklaser.ru/48495485011zmok4.pdfIn PDF document text
    • https://cdn.sqhk.co/mowamukar/hgdMvPc/vasojivaseforozowomiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392220/normal_5ff3f91ed2380.pdfIn PDF document text
    • http://itawegan.space/difference_between_antigens_and_antibodiesofrpz.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/ieSrief/bojixagonikezup.pdfIn PDF document text
    • https://tiguziriwisil.weebly.com/uploads/1/3/1/0/131071210/6255750.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383921/normal_6004f15958241.pdfIn PDF document text
    • http://fruits-summer.fun/tugugul58xw.pdfIn PDF document text
    • http://mon-fortuneo.best/druid_handbook_4ew86tv.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://gagonunanu.epizy.com/phool_aur_angaar_film_song.pdfIn PDF document text
    • http://nivugugop.rf.gd/50445712973.pdfIn PDF document text
    • http://lexepetilak.rf.gd/funny_certificates_of_appreciation_templates.pdfIn PDF document text
    • http://zilamefuwata.rf.gd/java_swing_form_layout_example.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_off00015193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15193 5112 bytes
SHA-256: 686540b444731a8a79b221da21f1976c1cbbcff9fa299586320b630b1fbf58de
font_01_sfnt_off000162e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162E7 11860 bytes
SHA-256: f2b3a51a6d11cd2b646408c45e318564ebbf7cc6a9c610cf16422c835fbbd631
font_02_sfnt_off00018ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AD8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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