Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a10e07b1088326…

MALICIOUS

PDF

72.2 KB Created: 2021-01-09 17:34:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 805ddb7081ad462f8af5a2252b3a356b SHA-1: c19cfcf5ab3fb44f21d3f5056f751c1ab992bfcb SHA-256: c3a10e07b108832678c779c9982392309575761672552bb2408ebbbb5a68b4f4
134 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains multiple external links, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though partially corrupted, appears to be a lure related to drone assembly instructions, which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=aplikasi+video+cutter+gratis PDF link annotation
    • https://viferoxabuged.weebly.com/uploads/1/3/4/2/134235394/mogupexe_dadusu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372967/normal_5ff757b1ea62b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380392/normal_5f8c8016e2870.pdfIn PDF document text
    • https://jilibawijoza.weebly.com/uploads/1/3/4/3/134363321/3cc53ba32bb4e56.pdfIn PDF document text
    • https://tupokigefadewun.weebly.com/uploads/1/3/4/7/134702618/574ae5213.pdfIn PDF document text
    • https://wudajelenap.weebly.com/uploads/1/3/4/4/134470879/224321.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453900/normal_5fc5ad16491ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8488895e-c816-4d40-ba69-82ada1e0941e/vivitar_aeroview_drone_assembly_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/49105968238.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/91165111825.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/autohotkey_windows_7_32_bit.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_off0000dcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB6 5356 bytes
SHA-256: 1591e796fe4f5a685066f053856d6e978718fa13cec03aff99d3bf18f25fccfe
font_01_sfnt_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 10784 bytes
SHA-256: b720cb3bd7187a210a1e140ae1b8926479488c030f99f74cf9f2bf3894bb474b

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