Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee15a7b8ac6cc35…

MALICIOUS

PDF

76.7 KB Created: 2021-03-26 07:28:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fd1cfb1295d15435d879fa41b34c39b5 SHA-1: 4899db6bb0c661ca1d2d870ee162a9258e54e5d9 SHA-256: 6ee15a7b8ac6cc35367689916a65356bf2988da586527523fdc18b9a291c48c5
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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=how+to+determine+iq+of+a+child PDF link annotation
    • https://molejurat.weebly.com/uploads/1/3/0/9/130969116/901ce6.pdfIn PDF document text
    • https://cdn.sqhk.co/tokexinolelu/tuJbOic/fomatapedavaburenavowilo.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/gT5mnkN/baby_growth_chart_weight_percentile.pdfIn PDF document text
    • https://cdn.sqhk.co/govazilose/jhiwWDF/xadobiretikabaf.pdfIn PDF document text
    • http://gugataze.iblogger.org/rocket_propulsion_elements.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/jEqgjjd/do_boxers_or_mma_fighters_make_more_money.pdfIn PDF document text
    • https://cdn.sqhk.co/lotivadafe/vheogi5/skype_latest_version_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419820/normal_604ddd9d26285.pdfIn PDF document text
    • https://senapuvuv.weebly.com/uploads/1/3/4/4/134459053/8743686.pdfIn PDF document text
    • https://vafumesaz.weebly.com/uploads/1/3/4/5/134589630/1424849.pdfIn PDF document text
    • http://mutalunepemaw.22web.org/beripuwabaxuvenunupaf.pdfIn PDF document text
    • https://kupolagaxex.weebly.com/uploads/1/3/0/9/130969851/8347399.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485943/normal_60098fef02ddc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_d2ca34cf743b4ec79b00bd1b376ecff0.pdf?index=trueIn PDF document text
    • http://misugivunuzu.epizy.com/52985659418.pdfIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_991507d9ec084fb1b2ae0884da72c1b9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/82aaff1f-3783-499f-a626-c3d32092b080/purple_cow_ice_cream_store.pdfIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_5e7a346f315044f1863499ba5ec61e3e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e114a396-60f8-4a97-8d42-199cca7c201a/how_to_find_cell_reference_in_excel_vba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17c01fb2-6b9f-4edb-80c8-ab55900c0205/68336789325.pdfIn PDF document text
    • http://xugigizipir.epizy.com/joint_probability_distribution_example.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_off0000ee34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE34 5264 bytes
SHA-256: d3960093ce8d41c329fdcbd3a29c9452d69e795f0eba49808b1351577cd90ddc
font_01_sfnt_off0000fffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 11152 bytes
SHA-256: 9deeb239156fca1a9a61637e0d545a8292e9aff8fbe26a28aea258f00599e015