Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c12fcbef1e0445b…

MALICIOUS

PDF

87.1 KB Created: 2021-03-18 14:48:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b79e03c4c8cedb2083804ff01cb854b0 SHA-1: 43dc994bd29865b4f79f40be1328a552da103fea SHA-256: 0c12fcbef1e0445b3dff9d645f3717862482b4d13b6f057dcf4cc40863ff09e3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 probability of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The embedded URLs, such as 'https://resalured.ru/strik?utm_term=blackshirts+and+reds+wikipedia', are likely used to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://resalured.ru/strik?utm_term=blackshirts+and+reds+wikipedia PDF link annotation
    • https://malinozibide.weebly.com/uploads/1/3/4/3/134380659/3190750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_5feaf3249e16b.pdfIn PDF document text
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/gevafepevekibom.pdfIn PDF document text
    • https://momukilogavar.weebly.com/uploads/1/3/1/4/131437465/9415782.pdfIn PDF document text
    • https://luludosob.weebly.com/uploads/1/3/4/7/134703274/495b94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379731/normal_5fe31e7fd4b57.pdfIn PDF document text
    • https://gobewuguwug.weebly.com/uploads/1/3/6/0/136056794/zodanilofuviju.pdfIn PDF document text
    • http://espacecmb.xyz/designing_brand_identity_epub47rht.pdfIn PDF document text
    • https://piturerakilapes.weebly.com/uploads/1/3/0/7/130775197/5748017.pdfIn PDF document text
    • https://memetunariva.weebly.com/uploads/1/3/1/4/131454345/6ba9bd66c74d0e.pdfIn PDF document text
    • https://vusuvokitajize.weebly.com/uploads/1/3/0/8/130874031/533211.pdfIn PDF document text
    • http://amaryllis.space/what_is_meant_by_tcp_ip_protocol_suite3jmic.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c81c9735-21af-473e-aa7e-7db7ac01a88d/44196468322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f44c47f8-416d-4b2d-b930-ad7c25d71db5/what_are_the_game_of_thrones_books_rated.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/232f1433-93df-4c8d-8fde-a582a0fe16b2/asp_net_mvc_dropdownlist_selection_change_event.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f191dc2a-32e5-48d5-a30e-ae03109b31b5/charlie_and_the_chocolate_factory_original_soundtrack_1971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c9f8588-3c03-49e5-9f06-1f51cecd41b5/casio_g-shock_gwg-1000-1aer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66248e48-5421-460f-b1c3-7c88274d48c9/vafixemid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8c50246-c41b-4d83-b6fd-642dc0f6885d/asus_x205t_ac_adapter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/835ee0a7-a509-4772-b07a-11b450719d66/maytag_top_load_washer_error_code_f5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc871dc7-a8b7-4316-a121-d9df0e3317f1/soda_stream_gas_bottle_refill_tesco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8675cd06-7c58-4acb-b53f-4fc7e92384e0/washington_state_university_ranking_us.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C9 5044 bytes
SHA-256: 5f06bed30dc13b5723cb27807dd7746caff731bd25e8203f50a733bb7381fb39
font_01_sfnt_off00011aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEC 11152 bytes
SHA-256: 92b8a23590bdf0bfefdd53bea63939854a5acb792c393d24c1712c4808df65d3
font_02_sfnt_off00014126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14126 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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