Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6143ca60ae3d65…

MALICIOUS

PDF

70.2 KB Created: 2021-03-03 18:53:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c675b6194ed86bef94c5f2f1601852e6 SHA-1: 92838a060cc8b3fc2def4a5e457d47d1c22d989a SHA-256: ad6143ca60ae3d6561f0001fd1c380a3cbfa03c6d66d23cd11699cc49e3937c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs that redirect to link farms hosted on disposable domains, suggesting a phishing or malware distribution scheme. The obfuscated document body and the presence of external URIs point towards an attempt to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/wix?keyword=theatre+ground+plan+symbols PDF link annotation
    • http://mawifit.iblogger.org/16745845118.pdfIn PDF document text
    • http://innov-cis.net/cambridge_primary_mathematics_downloads51om.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/gudufume.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460460/normal_5fc8fdcdafa36.pdfIn PDF document text
    • http://damita.fun/what_is_the_highest_calorie_item_at_taco_bells4ta2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410985/normal_603bf9119b466.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393754/normal_5feddab187bd0.pdfIn PDF document text
    • http://axecheat1.xyz/4265520387124m03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tituroxir.rf.gd/tikid.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/chori_chori_tere_naal_song.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_off0000d5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A3 5564 bytes
SHA-256: ec0a1cc10eabda4e77972bf8c286ab2ac53e1fac74ae37ce821e774276ff287c
font_01_sfnt_off0000e864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 10268 bytes
SHA-256: e7bb1abb17c66bce70814fa274a58eb25987e6cdf1003bcaee62e60ef698ac53

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