Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a0d0df6255fa60…

MALICIOUS

PDF

110.8 KB Created: 2021-01-31 08:03:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 668629858f0607d5c0f529bbb514d53d SHA-1: 6d706a6ff419232eaf256d6753d781a9cf40e585 SHA-256: e3a0d0df6255fa60eb3bc6a8360cbd5c129357fcf4bebe85d1f0be5bc3511333
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 or trojan. It contains numerous embedded URLs pointing to disposable hosting and link farms, indicating an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malware or conducting phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://traffset.ru/wb?keyword=mirror%20lululemon%20stock PDF link annotation
    • https://cdn.sqhk.co/durotula/gbhiqhh/gosupagagigemik.pdfIn PDF document text
    • http://shop-profildoors.ru/ppsspp_gold_1.8_0_apkz56qw.pdfIn PDF document text
    • http://gesabagipo.22web.org/best_european_travel_guide_books.pdfIn PDF document text
    • http://xofazonir.iblogger.org/zotuz.pdfIn PDF document text
    • http://verifedform.com/833616783423ixgo.pdfIn PDF document text
    • https://cdn.sqhk.co/mebereserab/imgeahd/41501272381.pdfIn PDF document text
    • https://cdn.sqhk.co/visukodo/iagjc53/15167767521.pdfIn PDF document text
    • http://yachts-4-sale.com/50_inch_tv_with_120hz_refresh_rate61q2g.pdfIn PDF document text
    • http://jezugelevafebir.22web.org/ardaas_movie_300mb.pdfIn PDF document text
    • http://espaceabone.com/7849966620221h9x.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/fgjjgKp/wogowugarutivunipi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mokimonanogi.rf.gd/alasan_amandemen_uud_1945.pdfIn PDF document text
    • http://wojegopuda.rf.gd/ayo_and_teo_reverse_challenge.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/coliform_bacteria_illness_symptoms.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_off0001766f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1766F 4804 bytes
SHA-256: f94feb8684e38349ec9065fcb5483efbca5487d46f8f02e5d352dcbf620906b8
font_01_sfnt_off000186be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186BE 11848 bytes
SHA-256: 15a0887ae3c1728eb7b98890469a42c4bfcb41cdeee4a8d32f5ad24b5859fe2d

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