Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e4608b17de3565…

MALICIOUS

PDF

96.9 KB Created: 2021-03-19 21:49:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a42e166a69f575d69e4d28e5a1cb073 SHA-1: 1623f4367ce82419e83468086069678ba2e6edce SHA-256: f5e4608b17de35651d98a31403ba126f66b29d172a6f9469a8e1d2e268ea4cec
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links pointing to various domains, many of which are disposable or associated with link farms. This behavior is indicative of SEO manipulation or a distribution mechanism for further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://midufefew.ru/wix?keyword=mills+e+godwin+high+school
    • https://mepodatadun.weebly.com/uploads/1/3/1/4/131452799/xidabofor-xuzunaj-rifikowefores-ribiw.pdf
    • https://badevejolaf.weebly.com/uploads/1/3/4/8/134867981/4453975.pdf
    • https://lepekogiba.weebly.com/uploads/1/3/1/6/131637498/fewupi.pdf
    • https://bedexupef.weebly.com/uploads/1/3/0/7/130775630/bd9e98.pdf
    • http://rexuwoxaga.sportsontheweb.net/new_moon_december_14_2020_meaning.pdf
    • http://miwasigal.mywebcommunity.org/is_being_flushed_a_sign_of_labour.pdf
    • http://jiwabozaxexe.mypressonline.com/dipaji.pdf
    • https://zakogekumepaxu.weebly.com/uploads/1/3/4/5/134598029/1140532.pdf
    • http://tiluvopira.medianewsonline.com/gixunofuloxu.pdf
    • https://levalezekavazif.weebly.com/uploads/1/3/4/6/134639406/eff8c.pdf
    • https://bigonukoduxa.weebly.com/uploads/1/3/2/7/132741189/ponidijubevituku.pdf
    • https://likufuzojelawaf.weebly.com/uploads/1/3/5/2/135298946/5e302ade06041.pdf
    • http://dirozigumifew.scienceontheweb.net/61881821092.pdf
    • http://pofuxubilet.sportsontheweb.net/75617238361.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d5837e0e-2dfc-45b0-960d-7a15b0cf16c8/37483585497.pdf
    • https://uploads.strikinglycdn.com/files/452700e8-53d3-480e-84f4-9a00c35fdfc0/39075012481.pdf
    • http://pidusagi.atwebpages.com/catalogo_novo_hinode_2020.pdf
    • http://xukokumo.myartsonline.com/85139912035.pdf
    • http://zagofij.onlinewebshop.net/lugamof.pdf
    • https://uploads.strikinglycdn.com/files/45785a72-eca3-41e7-aa91-bedad7ea152d/55644832974.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b97.bin
c9e02c9c6b9607eb4ec3bfb16a5bee2ad8947772e4ef3562677b8e675c600a80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B97 4992 bytes
font_01_sfnt_off00014cb3.bin
d8c56792151b289c4920bf99822fe4d9eac2160ded67509655150d4260449a55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB3 12100 bytes

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