Malicious PDF — malware analysis report

Static analysis result for SHA-256 6293859070e5c0ae…

MALICIOUS

PDF

83.6 KB Created: 2021-01-30 17:46:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: debfd1cfef0ed629be04b0efe565673b SHA-1: 11dc98b04a3bde7174e4dc980f3ac9ee5759a8b6 SHA-256: 6293859070e5c0aed162c05ee73189ac3091ad3d6b6d570602370912df475d91
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malicious redirection attempt. The document body, though heavily obfuscated, contains keywords related to 'romance books' and 'wkhtmltopdf', indicating a lure to disguise the malicious intent.

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://trafftec.ru/wb?keyword=best%20romance%20books%202019 PDF link annotation
    • http://petersikdar.com/93159240203z03v2.pdfIn PDF document text
    • http://arnautmebel.ru/10828306105l7x4q.pdfIn PDF document text
    • http://titoto.xyz/4094575141432zgv.pdfIn PDF document text
    • http://liketsven.xyz/nikapinimojg75n.pdfIn PDF document text
    • http://3gusevshop.website/web_tycoons_pvt_ltds5w2w.pdfIn PDF document text
    • http://hugertely.xyz/sadurojaviwegelala29j.pdfIn PDF document text
    • http://laura-egorova.ru/fogafozuwesezabbbwyf.pdfIn PDF document text
    • http://datinge.site/78134421546cz50h.pdfIn PDF document text
    • http://tk-time.site/let_it_be_piano_easyuyi1n.pdfIn PDF document text
    • http://nat-yoga.space/osrs_pickaxe_shop_varrockrgkk1.pdfIn PDF document text
    • http://juilopkiretlo.ru/pavonifqibua.pdfIn PDF document text
    • http://subaxidubuju.22web.org/credit_bureau_report_example.pdfIn PDF document text
    • https://cdn.sqhk.co/topedimerab/qXWGhbg/48032324287.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jusuberu/catapult_energy_transformation.pdfIn PDF document text
    • http://ziwebizivag.epizy.com/69655145358.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/adaalat_tv_serial.pdfIn PDF document text
    • http://gapisamiwabu.epizy.com/9818508986.pdfIn PDF document text
    • http://kijaripejugap.epizy.com/cousins_malayalam_movie_video_songs_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDD 5388 bytes
SHA-256: ac2b5a5a03f73b8e1a45bfcc348c628917a09a6a84f8725e58b0c7b77364132a
font_01_sfnt_off00010e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0C 10836 bytes
SHA-256: 79cc86bcc426dd671302fa94ec89360b31b147b2298443c859247fd77c1d5c02
font_02_sfnt_off000132fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FE 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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