Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b918ab0a88cca52…

MALICIOUS

PDF

83.8 KB Created: 2021-02-15 03:02:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 492d377070f9d3800f1a357d40cc8a80 SHA-1: e1beb456eae691eabead44ac95ce5afe28bf8f2b SHA-256: 5b918ab0a88cca52af6275f3a6513930a53e50ee9e8318b2e9a4d2a520f31d9b
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with critical heuristics indicating it links to known malicious redirector infrastructure and a large external PDF link farm. This suggests the document's primary purpose is to redirect users to potentially malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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://crophysi.ru/aws?utm_term=avatar+game++dedomil.+net In PDF document text
    • https://cdn.sqhk.co/tifapoxur/bQFific/dual_fuel_inverter_generator_remote_start.pdfIn PDF document text
    • https://mutakisutuw.weebly.com/uploads/1/3/4/7/134768563/tofaguxasatotag-finijomawafun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417309/normal_5fd2ccde28b59.pdfIn PDF document text
    • http://xuxugagutosi.iblogger.org/40845218550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_602059f8a4329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466379/normal_6015ad85a61ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426823/normal_5fd8993f68fa9.pdfIn PDF document text
    • https://gabanifuvumot.weebly.com/uploads/1/3/4/5/134588994/pejugad-fugegokelawizer-nifopaxul-negij.pdfIn PDF document text
    • http://lesedidunug.22web.org/30958947597.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/futamo/google_auth_android_app.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/77546334548.pdfIn PDF document text
    • http://xezinupuwe.epizy.com/93156455632.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/capa_de_la_atmosfera.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/vomukuzizilowowosas.pdfIn PDF document text
    • http://nimoxorud.epizy.com/mukafixavoxogux.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_off000109f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F3 5048 bytes
SHA-256: 8b1ce6dfcb368d5d63d004e83a7fdea9f0a08e23d1087c07230cffcd3eaef2ce
font_01_sfnt_off00011b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B17 11612 bytes
SHA-256: 1faabd1c782b4a408a32eecb38bfdce68ed3e30e425387bc1578e24668afe4aa

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