Malicious PDF — malware analysis report

Static analysis result for SHA-256 9108986fe35f8014…

MALICIOUS

PDF

75.5 KB Created: 2021-06-01 16:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 030b528dd4161b04761e6f45c2ba6b98 SHA-1: 55249f7a106396a3fe2d4fe34d0d2ed9a997702a SHA-256: 9108986fe35f80141fb1255f9f37795f753e036d51a88cedc08ac16ba56b3b86
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File Execution: User Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://infrive.ru/pbw?utm_term=mxq+pro+4k+firmware+update+2019+download+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383806/normal_601134fcc1d9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391925/normal_5fd03f54682db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380694/normal_5ffc2f151c8a2.pdfIn PDF document text
    • https://degugelusejife.weebly.com/uploads/1/3/2/6/132695568/3972900.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448718/normal_60277ec92cf0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_601e26ad4461d.pdfIn PDF document text
    • https://zudejafig.weebly.com/uploads/1/3/2/6/132681624/sesekejeg.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4474456/normal_60b5daec0ddfc.pdfIn PDF document text
    • https://mebudowafiwene.weebly.com/uploads/1/3/4/6/134629245/4364011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419828/normal_5fd9d4ac040c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492901/normal_5fe028e54edba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383137/normal_603e5734b7923.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382197/normal_600608cc67d81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://supatibu.pbworks.com/w/file/fetch/144418536/37278051479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1197933-9684-4ff5-b19d-2b900841ca74/next_diary_of_a_wimpy_kid_movie_2020.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144412419/quality_function_deployment_and_six_sigma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1604682-c265-4766-ad31-d7b3584859a9/23554375016.pdfIn PDF document text
    • http://jobojifitin.pbworks.com/w/file/fetch/144452142/47697017271.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/585b7905-200f-4a37-99df-20211d9dd283/puzadifipidorireloj.pdfIn PDF document text
    • http://siruzosu.pbworks.com/w/file/fetch/144446715/how_to_install_dlc_gta_v_ps3.pdfIn PDF document text
    • http://vawijoj.pbworks.com/w/file/fetch/144463752/60048108546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ff166e6-009a-4522-84f9-47b5ff8980dd/voxovupagav.pdfIn PDF document text
    • http://gufabewa.pbworks.com/f/how_long_does_myofascial_pain_last.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_off0000e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 5936 bytes
SHA-256: ff59c4b949040e2de00ff29754267e475349591533e4ee2a767ad48182d0d541
font_01_sfnt_off0000f782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 13460 bytes
SHA-256: cc2802e1288d36c9bf11efea2c8ff7337b9ad94203c2720f9c096cc028a2c8d2