Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e6c0f8249a6e9b…

MALICIOUS

PDF

74.4 KB Created: 2021-03-14 19:32:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 56619635a20b9c9701607f21841cdf38 SHA-1: 2552a9b38e82a6dda564f3a649ac0377b9758250 SHA-256: 44e6c0f8249a6e9b98d96aa6290bc1a31404e81610f1a9306090ce431f128b63
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with several heuristics indicating malicious redirector links and a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links. No scripts were extracted, but the primary attack vector appears to be the malicious URLs embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://crophysi.ru/123?utm_term=javax.+activation.+datasource+jar In PDF document text
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/1669480.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/cnidgMw/zombie_craft_survival_3d_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/kixarozikej/c9sChgc/gejokofagebigavoxov.pdfIn PDF document text
    • https://kumojazoj.weebly.com/uploads/1/3/1/3/131381946/840a59395839aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453560/normal_5fdfeedc4c9f8.pdfIn PDF document text
    • http://rerulekoba.66ghz.com/fezajugezom.pdfIn PDF document text
    • https://dawozonejuveru.weebly.com/uploads/1/3/4/4/134489779/8665283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372105/normal_60277171cc106.pdfIn PDF document text
    • https://cdn.sqhk.co/kulizuxekume/n2ji9nW/55881983923.pdfIn PDF document text
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/lugaziredoraninatute.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458635/normal_5ff3bdcd036b1.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/zuguvoxoki/daradofumo.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/danby_12_000_btu_energy_star_window_air_conditioner_review.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/between_the_sheets_tv_series_watch_online.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/mafote.pdfIn PDF document text
    • http://minudiginodege.epizy.com/kurovegomukakuji.pdfIn PDF document text
    • http://derasowuras.epizy.com/amistades_toxicas_libro.pdfIn PDF document text
    • http://nekoraxevab.rf.gd/jual_sony_rx100_iv.pdfIn PDF document text
    • http://xarugipofe.epizy.com/76946465428.pdfIn PDF document text
    • http://pigadanafoton.rf.gd/89803078445.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/how_to_get_famous_on_bitlife_android.pdfIn PDF document text
    • http://litemulum.rf.gd/stickman_backflip_mod_apk.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_off0000e574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE574 5124 bytes
SHA-256: 040ab83850a3c1c352c63878abc7a77ce807bce40ea59097a71b941fb09f21c8
font_01_sfnt_off0000f705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 10912 bytes
SHA-256: 6663d96e61558205faa14ac6cd4a1df37ff9f0652432ff28cf0c6deb76b6da71

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