Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a2d3d9bc3c9257…

MALICIOUS

PDF

79.5 KB Created: 2021-01-11 09:24:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: ba7da002e36fe7feda11fbf1363e2284 SHA-1: 4c153886834a5d4ee5e0a95cccf10e1fea585c47 SHA-256: 54a2d3d9bc3c925783445e236341921ce2723b563b7ee6137e044ff4cc381329
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'conversion of regular expression to nfa examples', suggesting a phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=conversion+of+regular+expression+to+nfa+examples In PDF document text
    • https://site-1171784.mozfiles.com/files/1171784/lizevuludewisamiba.pdfIn PDF document text
    • https://site-1175421.mozfiles.com/files/1175421/moxejunagub.pdfIn PDF document text
    • https://sabewuxibiw.weebly.com/uploads/1/3/4/7/134718514/71a25ce2c84f5f1.pdfIn PDF document text
    • https://rewegabelera.weebly.com/uploads/1/3/5/3/135390500/jedus-bupabosorel-robofatuzil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379848/normal_5fb73da90b6a1.pdfIn PDF document text
    • https://cdn.sqhk.co/pawosuku/s7CggTb/tijovowedawijatap.pdfIn PDF document text
    • https://site-1173692.mozfiles.com/files/1173692/jerovanurag.pdfIn PDF document text
    • https://site-1174272.mozfiles.com/files/1174272/share_website_on_facebook_with_image.pdfIn PDF document text
    • https://site-1173205.mozfiles.com/files/1173205/cane_creek_headset_installation_guide.pdfIn PDF document text
    • https://site-1168429.mozfiles.com/files/1168429/37318926593.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/xafaxotaful/pm_awas_yojana_mp_online_form.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE81 5252 bytes
SHA-256: 0d329bf37ed71502fc1563a170fdf8bff06fe204dc179387135501fd316b4028
font_01_sfnt_off0000f058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 12248 bytes
SHA-256: 559571a136086f344699958319e62eea870a2223c953feb5459d467d44bbea0f
font_02_sfnt_off0001199a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199A 16536 bytes
SHA-256: 7c4bc6b82b024c7f8f48b4552a293c57556be4ee7980c7cd2740e199cd698394

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