Malicious PDF — malware analysis report

Static analysis result for SHA-256 22333f1655079741…

MALICIOUS

PDF

77.0 KB Created: 2021-02-21 05:56:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 3a233d8d49e1ac5750569e37bdfef0d4 SHA-1: aec35b12ae58bb392121b052bce14fe20a853fae SHA-256: 22333f1655079741c4fda9ce28756034d6b11e9a4307f7e41c7dc1bda2a46581
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to temperature conversion, which is then redirected to a malicious URL.

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://jottigo.ru/strik?utm_term=how+to+change+the+temperature+from+fahrenheit+to+celsius+on+braun+thermoscan PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369185/normal_5fe7cd11d742f.pdfIn PDF document text
    • https://zokokemakate.weebly.com/uploads/1/3/1/4/131454090/tabumifizejutefat.pdfIn PDF document text
    • https://sudodufutela.weebly.com/uploads/1/3/5/9/135960501/3972362.pdfIn PDF document text
    • https://jiwuzutobaduf.weebly.com/uploads/1/3/4/8/134889186/e250b42630bcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405945/normal_602d76917a3d8.pdfIn PDF document text
    • http://xeeewq.xyz/33410016209tc67f.pdfIn PDF document text
    • https://bunutawopuzo.weebly.com/uploads/1/3/4/8/134868528/2b52aa9cd554a1.pdfIn PDF document text
    • https://mojoranazo.weebly.com/uploads/1/3/4/4/134403481/1770214.pdfIn PDF document text
    • http://laulu-go.ru/bogibuzpxgj.pdfIn PDF document text
    • https://welaxulisura.weebly.com/uploads/1/3/4/0/134042468/89d58c53e.pdfIn PDF document text
    • http://rmk4sale.xyz/47077752617153bx.pdfIn PDF document text
    • https://kadeniki.weebly.com/uploads/1/3/4/0/134097858/370422c6.pdfIn PDF document text
    • https://cdn.sqhk.co/fasaparoba/cjiiSLC/27319980879.pdfIn PDF document text
    • http://videohost.space/world_population_aging_report_2018x14pd.pdfIn PDF document text
    • https://kunaxujo.weebly.com/uploads/1/3/1/4/131406864/xonaluze-memumubumatozo.pdfIn PDF document text
    • https://vizifota.weebly.com/uploads/1/3/0/9/130969876/didixumugibuxet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448556/normal_5ff01a56daeac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF25 5504 bytes
SHA-256: 57619d80ea354192cf874d8eb0469fe8a5e33557baea8c927eb7987e9a52edb2
font_01_sfnt_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 11132 bytes
SHA-256: 2992ee31a47ee2a0c8f61f3c59af2ffd2bf87b6c3aa5f4146c4278561fc441a6
font_02_sfnt_off00011792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11792 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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