Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fca6b1ed6f3f1df…

MALICIOUS

PDF

72.3 KB Created: 2021-01-23 12:11:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 385fd530b76f5efe5a5e77753b165093 SHA-1: 77468b505ba540fe9181b99aecb775827c4fb922 SHA-256: 6fca6b1ed6f3f1dfb563bfaf5cebe1232ce4c7031897b440dd5604b7c1a225d7
66 Risk Score

Malware Insights

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

The PDF contains an embedded URI that redirects to a website, likely as part of a phishing or scam campaign. The ML classifier strongly indicates maliciousness, and the document's structure suggests it functions as a link farm designed to drive traffic to external sites. No scripts were extracted, but the presence of embedded URIs and the link farm heuristic point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/aws?utm_term=anti-+terrorist+commando+mission+2019+apk+mod PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476567/normal_5fd87a84810ec.pdfIn PDF document text
    • https://site-1192097.mozfiles.com/files/1192097/ruvorakujewuniliw.pdfIn PDF document text
    • https://site-1177025.mozfiles.com/files/1177025/bpe_ups_3kva_manual.pdfIn PDF document text
    • https://site-1255589.mozfiles.com/files/1255589/pen_pineapple_apple_pen_meme_template.pdfIn PDF document text
    • https://site-1166051.mozfiles.com/files/1166051/31905052822.pdfIn PDF document text
    • https://site-1173607.mozfiles.com/files/1173607/97705169738.pdfIn PDF document text
    • https://site-1230736.mozfiles.com/files/1230736/larisajarepepidixebe.pdfIn PDF document text
    • https://site-1168315.mozfiles.com/files/1168315/d_d_5e_dm_guide.pdfIn PDF document text
    • https://korexabareruwa.weebly.com/uploads/1/3/2/6/132680962/rasubox.pdfIn PDF document text
    • https://site-1166626.mozfiles.com/files/1166626/end_user_training_manual_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393911/normal_5fc99797bd6e0.pdfIn PDF document text
    • https://site-1241131.mozfiles.com/files/1241131/31923984802.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389821/normal_5ff8a2f70f167.pdfIn PDF document text
    • https://site-1250930.mozfiles.com/files/1250930/2013_buick_enclave_owner_s_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485705/normal_5ff76ed9e26ab.pdfIn PDF document text
    • https://site-1171745.mozfiles.com/files/1171745/55446744782.pdfIn PDF document text
    • https://site-1176339.mozfiles.com/files/1176339/clueless_fashion_pink.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426697/normal_600946b1ee0ff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DD 5348 bytes
SHA-256: b2072172c3dc6c4ebcbecf1224bd09f474f391ea9a485492d94506d25c0ca097
font_01_sfnt_off0000dc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4C 5752 bytes
SHA-256: 90e1e9ea5aeeb8476efbba65abe07d14890956422c220fd201dcab095ea7e069
font_02_sfnt_off0000efd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 10432 bytes
SHA-256: 2bbfdeacff9cb34e692f15697845e6d91431d41e236ddb050193ab2a3ebfdee9

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