Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcb3e02c63a4f11…

MALICIOUS

PDF

81.8 KB Created: 2021-01-16 11:18:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1b3b5767b65301f0de95e98a22aaeab0 SHA-1: 9aaf301a8435dbacea73769cc8953b0f6e1dea8a SHA-256: 5bcb3e02c63a4f1161dffc4e9e788a0d702532c34b61109fbd296047f404ad53
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically identified as a "link farm on disposable hosting" and another pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/aws?utm_term=regex+cheat+sheet+ruby PDF link annotation
    • https://site-1178749.mozfiles.com/files/1178749/black_shark_1_update_android_9.pdfIn PDF document text
    • https://sozuxeboniwuk.weebly.com/uploads/1/3/1/3/131381135/jokipoxojewube.pdfIn PDF document text
    • https://site-1173259.mozfiles.com/files/1173259/917927272.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/OhdNll0/25766246089.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476757/normal_60028a8cacb81.pdfIn PDF document text
    • https://site-1176586.mozfiles.com/files/1176586/pugegurilokivegep.pdfIn PDF document text
    • https://cdn.sqhk.co/xakelafu/PwfdgiL/sakufubagirapegizetijul.pdfIn PDF document text
    • https://cdn.sqhk.co/bedogipaxog/iahbqgg/69853524561.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368742/normal_5fd31b8da04d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_5f8ba5d23da1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_5f8af14c5de92.pdfIn PDF document text
    • https://cheatography.comIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/glioblastoma_multiforme_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/56515540254.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95E 5344 bytes
SHA-256: ccbe9369a1dd4aa9477d4edb4d5e6877ad9239d18759074b583fa41065e5cc1e
font_01_sfnt_off0000eb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 4688 bytes
SHA-256: ca63bf64ec9f3bd664bec3c29cc14ef22035c1619a0d2805ffd54e9c8de543a0
font_02_sfnt_off0000fcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFF 12064 bytes
SHA-256: 62a5798b092a7e6ecfdff2447ca0a535607dddf7bab04cc4d6d6a94a689dbc41
font_03_sfnt_off0001258b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258B 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb

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