Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7683a14d68cd03c…

MALICIOUS

PDF

116.6 KB Created: 2021-06-06 07:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 184e984f45119f0889ba94bb688f540f SHA-1: 510d3115e7d41413f82683732e455590c78b05eb SHA-256: f7683a14d68cd03c87cf8be261fce1811ec498e3733c09d0dba8d59e4986cfe9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to public speaking, designed to direct users to malicious external 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://medvor.ru/pbw?utm_term=how+to+begin+an+extempore+speech PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376372/normal_600b70f81e403.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490121/normal_5ff545a69640c.pdfIn PDF document text
    • https://jozugirizozixus.weebly.com/uploads/1/3/2/3/132303278/zogunuw.pdfIn PDF document text
    • https://zuxusesomopekem.weebly.com/uploads/1/3/5/3/135305840/7020699.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424029/normal_6060c20ac5a27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423453/normal_5fe4b305a3150.pdfIn PDF document text
    • https://vitaworitevazol.weebly.com/uploads/1/3/4/4/134484496/2197449.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390374/normal_6068d5c5ee11d.pdfIn PDF document text
    • https://wutejaguruloz.weebly.com/uploads/1/3/1/8/131871665/diwuxofexetaze-boxifule-wiparebitiri.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4464724/normal_60b079b24a519.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fokopaviwu.pbworks.com/f/dunaduto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb5dd7d0-e5c1-4bba-ae28-3df6e63b0985/how_to_change_battery_in_att_cordless_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85c523a3-8091-4b65-932e-d8ff5ec63af5/datev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e26bccd2-59c4-4988-875a-3316698c3c0d/gorilla_mind_review_reddit.pdfIn PDF document text
    • http://tujolim.pbworks.com/w/file/fetch/144707268/69328152746.pdfIn PDF document text
    • http://minuwaxiper.pbworks.com/f/computer_networks_and_internets_6th_edition.pdfIn PDF document text
    • http://tuvovazuvezo.pbworks.com/w/file/fetch/144669765/88210192805.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144458073/blood_type_diet_chart_o_negative.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_off00018c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C41 5576 bytes
SHA-256: 609847fe26b523632d577530f48d570c0dbd90487cce053b8df1ee4ffdc83eb0
font_01_sfnt_off00019f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F28 11112 bytes
SHA-256: c455f30ce06a1738445cc4471c6d53514d96f36d760301adbef288f1a96190b8

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