Malicious PDF — malware analysis report

Static analysis result for SHA-256 054d93174e9cc90c…

MALICIOUS

PDF

91.7 KB Created: 2021-04-16 15:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6dd7cce581a0b5d06e00a4886b0ca713 SHA-1: 91078189a06b83b1899f1c9564993339d48b73af SHA-256: 054d93174e9cc90c4ffcf0bc931aa33f761eeebb3e817bff81b6fe82a320560a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. One URL, 'https://resalured.ru/strik?utm_term=draw+tite+activator+2+installation', is particularly suspicious. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/strik?utm_term=draw+tite+activator+2+installation
    • http://instapriz.site/8358308611062n1d.pdf
    • http://mavigawika.scienceontheweb.net/fisher_price_newborn_to_toddler_portable_rocker_recall.pdf
    • http://tijukilebag.getenjoyment.net/xiwamalovifegusibu.pdf
    • http://fonexewof.mygamesonline.org/axiologia_juridica.pdf
    • http://sexesex.site/apple_ipod_shuffle_5th_generationukiqt.pdf
    • http://junumidutuzakox.getenjoyment.net/solo_guitar_playing_frederick_noad_download.pdf
    • http://pozezan.mygamesonline.org/self_esteem_bible.pdf
    • http://nemagufi.mywebcommunity.org/73143418776.pdf
    • http://aicberg.net/scag_cheetah_61_parts_diagram3jiyc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gurafoga/scarpetta_pinot_grigio_tech_sheet.pdf
    • https://b7d3a0ae-8059-487b-8826-088776693174.filesusr.com/ugd/8d23e4_0a8e95a464a5410ea0c580fe2adc87b4.pdf?index=true
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_35afe95cdc3e44d8a2068cc86af0c3b3.pdf?index=true
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_0fc05c8df1c349b898cd2576623dd1ce.pdf?index=true
    • https://s3.amazonaws.com/zubuwujoxom/blackdecker_st9000_6.5_amp_14_inch_electric_string_trimmer.pdf
    • https://s3.amazonaws.com/rebesudanolo/petamejerejadadipufenoz.pdf
    • https://c207dc97-0cc9-441e-8caf-a702c1639d46.filesusr.com/ugd/36abe8_f6b53392eac84a82b0872cfea46de89d.pdf?index=true
    • https://f85e9a30-dbb9-40fd-a66d-53bd7daafe07.filesusr.com/ugd/1b9faa_4edb0bd3d1ba4d9389f794662690d423.pdf?index=true
    • http://dozopedatofol.atwebpages.com/83563872525.pdf
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_969391d60def47c6b43985a041c16e07.pdf?index=true
    • https://b9387e75-0942-48a6-8a47-0bd3f0224277.filesusr.com/ugd/fc485c_6dfc66136f204d4a86399fd4764fba8d.pdf?index=true
    • https://s3.amazonaws.com/kokesatodixon/electrical_panel_schedule_template_excel.pdf
    • http://kikanelomer.onlinewebshop.net/asme_section_8_division_1_free_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b0c.bin
c841eeb83b88c93f2f7c7582a37b923da1e6230fd59147220ba18e8f64c68f41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0C 4864 bytes
font_01_sfnt_off00012bb1.bin
4957c03901396dcb5b0ab7d092a2a0d6d7fa9aedcbd7754f3de636f8fc44a435		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB1 11104 bytes
font_02_sfnt_off00015122.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15122 4324 bytes

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