Malicious PDF — malware analysis report

Static analysis result for SHA-256 4520c35a7b101f97…

MALICIOUS

PDF

80.3 KB Created: 2021-02-17 16:49:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4cc9fa38259027f2d26baa20a8728edc SHA-1: e159c27f595aa25485076a492a2ec67efd21d4ba SHA-256: 4520c35a7b101f97b5e95a7782bb2f44fb41e87089998464d8dc06585173f8f3
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating an attempt to redirect users to malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

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://druttle.ru/123?utm_term=what+scares+you+about+the+future PDF link annotation
    • http://teasmall.space/12009686711bhj4f.pdfIn PDF document text
    • https://figokafudifugi.weebly.com/uploads/1/3/1/3/131383964/910ee.pdfIn PDF document text
    • https://wopebodolafov.weebly.com/uploads/1/3/2/7/132741389/71e006ff.pdfIn PDF document text
    • http://winoraama.fun/trader_joes_frozen_turkey_burgers_cooking_instructions82rxx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427504/normal_5fedc3672e71a.pdfIn PDF document text
    • http://top-salez.site/223947424783h9fz.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/DhjXNhO/wisabiju.pdfIn PDF document text
    • https://puziwifatewir.weebly.com/uploads/1/3/4/7/134715637/2273293.pdfIn PDF document text
    • http://gratoramaa.website/latomafuxaduguv2v2p.pdfIn PDF document text
    • http://bitcoins-profits.com/mikrokosmos_bartok_espaolxj01d.pdfIn PDF document text
    • http://wei-nmvc.com/basic_kanji_book_bonjinshafmrdz.pdfIn PDF document text
    • http://ighelpcenter.xyz/kuvaboramojor6dzw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462066/normal_5fe7f7c452552.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/68g9UZs/85713027189.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371812/normal_5ff062b9a3571.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463034/normal_5fe38f22ad88d.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 5192 bytes
SHA-256: 117e9b60f89a2ecd56e0a60c7a3b0f167af14babdc35f775c3d1c0f68d6602fc
font_01_sfnt_off00010e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E76 10584 bytes
SHA-256: 402ec786fa54ce6f3fb6fe50ea6df5e60c9611b492f6840c04f28323faed5164

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