Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba050957cb0420a1…

MALICIOUS

PDF

75.5 KB Created: 2021-02-03 18:53:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 12d6c4c0c23ab73785233b8a4f2a8197 SHA-1: 79fb17e822bcfa71af637644879e09c73012b988 SHA-256: ba050957cb0420a128c3d7a39c75f0f804d736687875a83c82d50d7caf1212ae
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one prominent URL suggesting a lure for 'Superuser root pro apk'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the nature of the lure point towards a phishing attack delivered as an attachment.

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://maypoin.ru/123?utm_term=superuser+root+pro+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416787/normal_60144751a1bd1.pdfIn PDF document text
    • https://cdn.sqhk.co/tuledapozato/CaDgcyo/bird_wyvern_gem_farming.pdfIn PDF document text
    • http://forumapu.iblogger.org/jegowajawumilup.pdfIn PDF document text
    • https://cdn.sqhk.co/fowurona/jergfgh/25030534482.pdfIn PDF document text
    • http://pop-marketplace.ru/763952938097omk6.pdfIn PDF document text
    • https://tewedarutomos.weebly.com/uploads/1/3/2/3/132302993/5305929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5fdc019660de5.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzudulo/dJhcZhc/dining_room_light_fixtures_black.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451348/normal_5feebe13b196e.pdfIn PDF document text
    • http://gonzo-3d.com/garmin_300xl_approacheso3649.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476152/normal_5fdfc8a286b91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465003/normal_5fcb521800484.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koxunum.epizy.com/81727566403.pdfIn PDF document text
    • http://zilomit.epizy.com/simple_biodata_format_doc.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_off0000e1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C2 4948 bytes
SHA-256: 385359b0cad6a639c338cc5995aee86f2f8e7a812431b6c12026f87384ebf94d
font_01_sfnt_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 17556 bytes
SHA-256: afb5e77fd5ac9fcce9fd99e9186f5a3c88fc843bcb6686ef4da5feb25c060ba4

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