Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e70a9473583d68a…

MALICIOUS

PDF

180.2 KB Created: 2021-03-19 21:52:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6efd1cb735ace835bd1b8c04bc25f05c SHA-1: 9ef850870e6a8007c993f48cc76dc87a8090b47e SHA-256: 5e70a9473583d68a403db5186e25fabd7f93cd405689feda6fa567e2145b899e
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically `https://crophysi.ru/123?utm_term=html+layout+templates+free`. The document body, though heavily obfuscated, suggests a lure related to 'HTML layout templates free'. The presence of numerous links to disposable hosting and the ML classifier's high confidence score indicate a malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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=html+layout+templates+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369933/normal_5fe77aee26f4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417314/normal_603212d2dd049.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449789/normal_60075aff0e0a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421350/normal_5ff3604775822.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486997/normal_6018ca15c5f66.pdfIn PDF document text
    • http://pinerapidsrr.com/my_airtel_tv_recharge_offerez26z.pdfIn PDF document text
    • http://bewilotaweje.mywebcommunity.org/blank_award_template.pdfIn PDF document text
    • http://prodive.su/60051275624q7p1w.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/44811125733.pdfIn PDF document text
    • http://strgb2.ru/35924097617nbfbp.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/pedazujiwarulo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486041/normal_6054d849a0d71.pdfIn PDF document text
    • http://gonzo-3d.com/free_video_poker_trainer_jacks_or_betteruic23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485448/normal_5ff27295124d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368238/normal_5fdec867cbe74.pdfIn PDF document text
    • http://ru-dev.xyz/is_mechanical_pencil_lead_dangerousl1tym.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479435/normal_60465a8bf1a16.pdfIn PDF document text
    • http://moxipafuxoxo.mygamesonline.org/a_horse_walks_into_a_bar_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2492064-8e23-47c4-9f8a-237d3ccd6f97/melit.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/totim.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/kakariko_village_violin_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e012a637-86b6-46ad-af63-3a15771589c3/54061837384.pdfIn PDF document text
    • http://piwakitidi.onlinewebshop.net/how_many_navy_seals_died_in_training_each_year.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a922934e-c4c6-4f49-8e7a-dbea6f3f5bf3/raxogixigutemibufam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2e81a3c-1a6c-4fad-b54b-ee1a3b134381/safije.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_off00028d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28D3C 5112 bytes
SHA-256: 36b2abb13ed44fef3f424c6d86b3b70bb6be107fad1f1cd912c37512952329d9
font_01_sfnt_off00029e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29E90 10572 bytes
SHA-256: 1e06b4f4990e0ab15b14e04a29cb08c00f7a2fc3eb0e51e535c3cc4c2706239e