Malicious PDF — malware analysis report

Static analysis result for SHA-256 031aa8d684f319c5…

MALICIOUS

PDF

76.6 KB Created: 2021-02-26 17:48:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0c496bf1646d1c7404c2ed388008327b SHA-1: 6b3f7d1238b854b5791896eab4406b90df964dbf SHA-256: 031aa8d684f319c580eec49d9df1e3e6b48e0ccafaee190b0184bf719607d52d
194 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicative of a link farm designed to redirect users. The presence of a 'download' button lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/strik?utm_term=advanced+normalization+tools+download PDF link annotation
    • https://cdn.sqhk.co/zetoreli/B7hbijg/beli_pulsa_online_indosat_5000.pdfIn PDF document text
    • https://jepukarebav.weebly.com/uploads/1/3/5/3/135321711/28501fc1.pdfIn PDF document text
    • https://lonokowikur.weebly.com/uploads/1/3/5/3/135384913/pinaratuxu_kukumun_sunoraxa_podelo.pdfIn PDF document text
    • https://cdn.sqhk.co/lazogapuvo/diaiehd/house_paint_colors_exterior_ranch_style.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484636/normal_5fe2d04cbf5f9.pdfIn PDF document text
    • http://help-copyrightservice.xyz/p6_eppm_web_services_administrationkqm2p.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/what_is_the_main_difference_between_an_llc_and_a_corporation.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/38161182922.pdfIn PDF document text
    • http://procripton.com/samsung_note_10_wallpapersn6pdi.pdfIn PDF document text
    • http://sungo1.space/how_to_descale_a_nespresso_vertuoline_machinewbtny.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikagisato/ggxjfie/zutofedupomalesebeso.pdfIn PDF document text
    • https://nerilumasufut.weebly.com/uploads/1/3/1/4/131437044/bd624c67.pdfIn PDF document text
    • https://cdn.sqhk.co/rijunawep/gjYhiii/dragon_craft_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jemileti.atwebpages.com/best_way_to_get_a_new_pair_of_glasses_audio.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_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 5276 bytes
SHA-256: a71a346744f558becbccd18ea4382c131a8d7e6e22cd9c227340c82c09ca9e50
font_01_sfnt_off00010034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10034 10836 bytes
SHA-256: 6d3fc5a867d8692582811ba03c445350ffd7d2016ceccd7696c5a82fa98d38da

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