Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d361787af54529f…

MALICIOUS

PDF

69.7 KB Created: 2021-03-15 06:40:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 844c33cb56a55780aa8596e8f1d72970 SHA-1: 19a112c527e0396c5a11b4acfaa06882d3ac64f4 SHA-256: 5d361787af54529f057e16a30a10ba845f97abbb944d0aa173d7c779cc2a25aa
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO spam. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=roblox+february+2020+promo+codes+mask
    • https://cdn-cms.f-static.net/uploads/4372740/normal_601d6bc25de60.pdf
    • https://cdn-cms.f-static.net/uploads/4385204/normal_60200367deb5d.pdf
    • https://cdn-cms.f-static.net/uploads/4407983/normal_603b7cb7bf425.pdf
    • https://cdn-cms.f-static.net/uploads/4426944/normal_604d2dd578dfd.pdf
    • http://fokikizuxijem.iblogger.org/21968658281.pdf
    • http://gitikirazidapi.medianewsonline.com/canon_eos_rebel_t3i_600d_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4503035/normal_601f1ba7e6889.pdf
    • https://static.s123-cdn-static.com/uploads/4493579/normal_5fdf469e61003.pdf
    • https://cdn-cms.f-static.net/uploads/4384464/normal_602c33ae65f96.pdf
    • https://static.s123-cdn-static.com/uploads/4404725/normal_5fe2a4729a5b7.pdf
    • https://cdn-cms.f-static.net/uploads/4379385/normal_6021a30e3e98f.pdf
    • https://static.s123-cdn-static.com/uploads/4413838/normal_5ff24b218ad54.pdf
    • http://nepatokada.mypressonline.com/must_watch_anime_series_all_time.pdf
    • https://static.s123-cdn-static.com/uploads/4498392/normal_5fe2bab31d24d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://56076a71-1b70-41e8-afe1-d547c394b4ee.filesusr.com/ugd/ab0d05_6c703bf35b54408ca02b2236103ce547.pdf?index=true
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_99cddd5ea8634001a427ca79e5328f48.pdf?index=true
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_f896a9aa6e374ee28b7a0cd6cd292836.pdf?index=true
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_f2297191f8a34cfd858b7211cf34f635.pdf?index=true
    • http://mixonanax.epizy.com/guide_book_of_class_9_science.pdf
    • http://tuguwobafadurot.rf.gd/best_audio_editing_software_android_apk.pdf
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_9ac7002478b047b69d0643acaa87a040.pdf?index=true
    • http://zovewopot.epizy.com/jipurajefixexite.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf76.bin
b879f31cc80f078ff5629a10d42bc9fcc5eb9b335eaa78d425f1a84a5accdf2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF76 5956 bytes
font_01_sfnt_off0000e3b4.bin
3e7e05c0e631373de44f9b35985c21a8b9cc69f348467ffd6dbb83f918d607a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B4 11108 bytes

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