Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec95a5a6d9a072f…

MALICIOUS

PDF

73.6 KB Created: 2021-02-06 01:05:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cca6c38da5836e94cdf2808ef28b2683 SHA-1: c469009dd152e60913474f8226406d1671f9ce04 SHA-256: 3ec95a5a6d9a072febc84acd3ab3b201db22f92c62c1e5bdf56e346fd372af9a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, indicative of a link farm. The document body, though heavily obfuscated, suggests a lure related to an 'answer key'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://leonvi.ru/123?utm_term=kinetics+of+crystal+violet+fading+answer+key PDF link annotation
    • https://fuwidomanajano.weebly.com/uploads/1/3/0/8/130874101/6834630.pdfIn PDF document text
    • https://zajefogana.weebly.com/uploads/1/3/1/4/131407312/xukavikitogisul_munun_rofawerowage.pdfIn PDF document text
    • https://kasababafaraw.weebly.com/uploads/1/3/5/3/135336348/58804.pdfIn PDF document text
    • http://vash-fasad.live/seadream_yacht_club_miamizzszb.pdfIn PDF document text
    • http://polnews.xyz/28550856128lm0p6.pdfIn PDF document text
    • https://jorojiwelipevo.weebly.com/uploads/1/3/5/3/135393556/2577605.pdfIn PDF document text
    • http://aycotoro5.xyz/dragon_quest_8_3ds_strategy_guidef2gat.pdfIn PDF document text
    • http://baffer-shop.space/detukemaduruxuye5r0.pdfIn PDF document text
    • https://tumazalewiguta.weebly.com/uploads/1/3/4/7/134755417/0d8a21.pdfIn PDF document text
    • http://igonlinesupport.com/44514126201si9kj.pdfIn PDF document text
    • https://kabaposirivapej.weebly.com/uploads/1/3/2/6/132680813/d6bce21c6.pdfIn PDF document text
    • https://vepibasizux.weebly.com/uploads/1/3/1/3/131380915/pesigowe-rubefokam.pdfIn PDF document text
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/5506479.pdfIn PDF document text
    • https://zufavaxevonek.weebly.com/uploads/1/3/0/9/130969036/568415.pdfIn PDF document text
    • https://kixivoveluvib.weebly.com/uploads/1/3/0/7/130775150/nofusikum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nawuvud/aspectj._jar_java2s.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/cambio_climatico_en_chile_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/30158244420.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/dolopijemonuxojemulu.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/51787078580.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_off0000dec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 5476 bytes
SHA-256: ca39bd3bb63c4a289bb082f75626600e89997282eafadeb07fa0d512dc47dc5d
font_01_sfnt_off0000f19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 11644 bytes
SHA-256: db482f039362ef0a878fac3aa52daf4d85f262ee8063083a37f5cb9cff466c19

Open this report in the interactive analyzer, or submit your own file for analysis.