Malicious PDF — malware analysis report

Static analysis result for SHA-256 0681efc19823fdf4…

MALICIOUS

PDF

82.0 KB Created: 2021-03-30 00:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5a1ec7003ca7a1995867a71413c7e303 SHA-1: 8f0fa7661dcbdf9db736453fe5f80f3c79267444 SHA-256: 0681efc19823fdf4ce97ab9eff7d56432fce4269e584f76b59db24741e4a00f7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one URL pointing to a potentially malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites.

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://resalured.ru/123?utm_term=numbers+in+german+language+pdf PDF link annotation
    • https://cdn.sqhk.co/vudupapuj/Shg2hef/16290055348.pdfIn PDF document text
    • http://nigemutekilum.mypressonline.com/sakovirotesopujavaxeju.pdfIn PDF document text
    • https://cdn.sqhk.co/lekifuwixal/giifib7/funulivopesorafa.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/ewshcjc/tedivuvewubigudidifiver.pdfIn PDF document text
    • https://cdn.sqhk.co/mumepefofise/lGo1WKr/canton_chrono_509_dc_manual.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/96068826283.pdfIn PDF document text
    • http://finoginujowiwi.mypressonline.com/is_there_a_sequel_to_mrs_peregrine.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/d8c2566b-75c8-4ede-bb74-3f962568d926/furare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/113193a0-0677-49a2-9b6b-b8da33832a52/what_is_demonstration_teaching_strategy.pdfIn PDF document text
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_9de8e986dd884f83b36028fba0a49308.pdf?index=trueIn PDF document text
    • https://206c1dc7-391c-4b20-ac64-b63c97020fd4.filesusr.com/ugd/87773f_80db06825fa24d58ae6c36c5cb708d4f.pdf?index=trueIn PDF document text
    • http://rosajeku.myartsonline.com/platos_republic_summary_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34e4327f-5e7f-49a8-8146-7a54019d86a1/how_to_clean_range_hood_filter_with_ammonia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b26a17a5-26a5-4924-8b0f-466ff62188b1/4332468988.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_384c2c3f80434de99d95019441a84b56.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c0a1f7b-6b4a-4abe-bba9-7995410d60a0/81159662962.pdfIn PDF document text
    • http://penanaras.myartsonline.com/24765879987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4b53ddd-11ec-40bd-a03b-ca2cf348154d/kumos.pdfIn PDF document text
    • http://wififeju.atwebpages.com/asisa_cuadro_medico_cadiz.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_off0000f3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DA 5160 bytes
SHA-256: d4d152017565155eb1130900a60ff630eab8416794acc2fac7445d846d45eda2
font_01_sfnt_off0001053b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053B 12320 bytes
SHA-256: 6f7e739d0ff1de17d596148cd8aca046329fbc5176e361fbec454bfe2ba9c56c
font_02_sfnt_off00012cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFE 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333