Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81d297ebadeb3f7…

MALICIOUS

PDF

86.3 KB Created: 2021-03-05 20:56:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 83795f4c39c22602a93e86b9752a26d0 SHA-1: 2dbef01692ab55e0b605f545528cedc6ddbec7a1 SHA-256: c81d297ebadeb3f77169837de0638b26057d1e9dfc70894dd4d1808016bb61fb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://mezovuduw.ru/wix?keyword=lisa+guyer+band PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450513/normal_601f579b692de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_601fb39fe5e69.pdfIn PDF document text
    • https://zulevoto.weebly.com/uploads/1/3/2/6/132696122/7462553.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501193/normal_5ff816f5e9309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445334/normal_60354ab494ef3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369191/normal_5ff1e1de4e28c.pdfIn PDF document text
    • https://lamuwopinu.weebly.com/uploads/1/3/4/6/134632291/e32f22ae52c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413368/normal_5ff46d106b063.pdfIn PDF document text
    • https://wazaxilam.weebly.com/uploads/1/3/4/7/134726650/1976955.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387565/normal_5ff9343648a58.pdfIn PDF document text
    • https://biwemazisemu.weebly.com/uploads/1/3/0/9/130969041/b73252dbef618.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://zefojebenodimu.rf.gd/musul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/557ac94d-32f1-41fa-a359-959530ff2410/dbx_driverack_pa_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4d8c5fc-e5d9-4174-8179-91bbbd9801cd/zolasodawaxodazuzapa.pdfIn PDF document text
    • http://zefojebenodimu.rf.gd/how_to_simplify_fractions_on_a_ti-30xa.pdfIn PDF document text
    • http://ribaxexumipo.rf.gd/revavunufesumomikutegazur.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/sunadu.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/bootloader_unlock_apk_sony.pdfIn PDF document text
    • http://fevejalamozek.epizy.com/nexoris.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_off000108a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A8 4836 bytes
SHA-256: 51701be8f6bf8b04a547e38aebee1fdb1578da0af13caa7ffb4922382ccd159d
font_01_sfnt_off00011913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11913 10900 bytes
SHA-256: 3292b85444fde411ea352d5f7ebd1b186c4b3ca4b3ad8828b7547718f2e02bd8
font_02_sfnt_off00013e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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