Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d2ac80f013f78c…

MALICIOUS

PDF

79.3 KB Created: 2021-04-17 05:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 81198c0be103edb3392297b11c742ff6 SHA-1: 2efee56add8313f5d28d5a8154c8f3b8ee1fec50 SHA-256: a7d2ac80f013f78c630503d121431a145f097e018f13dd66d4afa3bd6662e19a
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 hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/strik?utm_term=best+zoom+icebreaker+questions PDF link annotation
    • https://cdn.sqhk.co/reriwoduriju/qhezSjb/zokonamitixixa.pdfIn PDF document text
    • https://lipijunozawisek.weebly.com/uploads/1/3/4/7/134721324/5326746.pdfIn PDF document text
    • https://vomakitiba.weebly.com/uploads/1/3/1/3/131384058/4237648.pdfIn PDF document text
    • https://cdn.sqhk.co/zazifutunoj/MQgfjgX/server_stats_bot_use.pdfIn PDF document text
    • https://cdn.sqhk.co/dagufiwus/eF7icif/dreamedia_home_theater_youtube.pdfIn PDF document text
    • http://sanezukevuzav.iblogger.org/45408719828.pdfIn PDF document text
    • https://pevusipifo.weebly.com/uploads/1/3/4/8/134863194/7f2df.pdfIn PDF document text
    • https://sagaragevuba.weebly.com/uploads/1/3/4/6/134685912/3953871.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_53e542ea45454d07be55fae1e6e50bef.pdf?index=trueIn PDF document text
    • https://f1fb087f-5d49-4061-aa02-230b108315d3.filesusr.com/ugd/645068_cf653e7448d14d1ab5a25ab1ef2591fa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2356aa72-45bd-4f53-8862-c743ac8827f5/nirajufuzirejixe.pdfIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_9bf6dbef264a4efebb38228fba33e721.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a97c711b-9d2d-4a49-bddf-35120ea395b9/27499607316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7997009-65d9-4a9d-b928-795d286b8ee6/74354032617.pdfIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_5963a9847f5a4ef3bbdaa26beb0e4635.pdf?index=trueIn PDF document text
    • http://mijikabetabup.rf.gd/43963923999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a567104a-5c75-4fae-bad7-1ec229bd7bfd/kenmore_500_washing_machine_wont_spin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38211b5a-02c1-405f-bd45-6e2f28c04fe4/war_of_the_worlds_2_the_challenge.pdfIn PDF document text
    • http://vedisupekak.epizy.com/mojinemafegosolodinido.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_off0000f784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF784 5340 bytes
SHA-256: 28ee07de7e7e20c8a6b87509700e3397f77b596fb023ad004b7f558bd418edae
font_01_sfnt_off000109ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AC 11176 bytes
SHA-256: dc729f93d8e16d2e0f5bbbc4a7f50a7f21689698369757a6af3213a3396cade6

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