Malicious PDF — malware analysis report

Static analysis result for SHA-256 e321184e717edf20…

MALICIOUS

PDF

77.0 KB Created: 2021-02-18 05:07:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b83320f21c1d069be297508acb4e4fbb SHA-1: 2cc8c7e546610380de7be3d6ec0611c02307271e SHA-256: e321184e717edf2055a58a42bf19dfb4b89212f1503e7c296f3acf309d412979
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/123?utm_term=how+to+calculate+normal+distribution+in+excel PDF link annotation
    • https://cdn.sqhk.co/niwuruba/idUgeJd/99746778224.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/DjdTijr/cinemark_peru_megaplaza_cartelera.pdfIn PDF document text
    • http://gouliwer.online/12789255565zs89i.pdfIn PDF document text
    • https://cdn.sqhk.co/xavonepez/hdrgghj/sigelevexiveganategu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490720/normal_5ff5002e9c5ab.pdfIn PDF document text
    • https://cdn.sqhk.co/murofoli/Uzha6jm/100_percent_free_dating_sites_for_seniors.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/Ieejchf/cat_ear_yeast_infection_contagious_to_humans.pdfIn PDF document text
    • http://ovca.space/10890177753hs4r6.pdfIn PDF document text
    • https://wubudebekezame.weebly.com/uploads/1/3/0/7/130740051/ruvajuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477637/normal_5ffc175ba24fa.pdfIn PDF document text
    • https://waziketezu.weebly.com/uploads/1/3/4/6/134648841/844251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457330/normal_601dd03e038ef.pdfIn PDF document text
    • http://lalashoppen.online/gimewunamajagakivedosupethv9k.pdfIn PDF document text
    • https://cdn.sqhk.co/pedidagow/a7jiCcO/liguduru.pdfIn PDF document text
    • https://dakesepev.weebly.com/uploads/1/3/4/3/134308776/setuxobog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000eedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDF 5348 bytes
SHA-256: 828e116569778bf896a08bc1549e8c9b9079fb0c77ada1773e17a79b68caa5b1
font_01_sfnt_off00010103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10103 11180 bytes
SHA-256: d49003c193bd7973c6e3671e31d0e88a627b09a207238329fd6b455df227b5b3

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