Malicious PDF — malware analysis report

Static analysis result for SHA-256 750438012218487c…

MALICIOUS

PDF

73.1 KB Created: 2021-02-15 05:59:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cb819b8ca48ce43ac5c5f31bd2be86a9 SHA-1: 824d5c6b1c2d38bfed971f425c9f862b2ea48773 SHA-256: 750438012218487c6eade3962d8320cf19567ae2a04e7b1bac3ea2484fda41b0
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable or suspicious domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to 'worksheet answers', reinforcing the lure. No scripts were extracted, but the presence of multiple external URIs suggests the PDF is designed to redirect users to malicious sites.

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 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://leonvi.ru/wix?keyword=section+2+types+of+bonds+worksheet+answers PDF link annotation
    • http://idealslimitalia-official.site/82369898222mm5hb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375209/normal_5ff8aca1265b4.pdfIn PDF document text
    • http://zegumuwuvibeb.iblogger.org/wood_burning_stove_user_guide.pdfIn PDF document text
    • http://nexefugo.iblogger.org/46164895835.pdfIn PDF document text
    • http://mihetos.xyz/koxunegowujoneravariwegogom09b.pdfIn PDF document text
    • http://sluzhba1.net/free_printable_phonics_worksheets_digraphs55zfz.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/qgjhhkZ/53388660591.pdfIn PDF document text
    • http://idealica-itufficiale.website/xenitodolagodedefebocyqln.pdfIn PDF document text
    • http://ponaleke.iblogger.org/excalibur_warframe_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sidokanema.epizy.com/snake_game_for_keypad_phone.pdfIn PDF document text
    • http://pajamubo.rf.gd/40849677471.pdfIn PDF document text
    • http://dudasuz.epizy.com/bootstrap_form-_control_width.pdfIn PDF document text
    • http://jitemawuvefogox.epizy.com/blender_3d_app_for_android.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_off0000e09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09A 5844 bytes
SHA-256: 54d03669752e928ec859675043584fadfd10bc8ee7ccce8bb088e735dd261bbb
font_01_sfnt_off0000f49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49B 10272 bytes
SHA-256: 733183686f1a2078afb03a1571aa798f85caab57ee24520327989186661d47f6

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