Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8920c0fa961e98a…

MALICIOUS

PDF

76.1 KB Created: 2021-03-07 17:32:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9a17d8cdf44262f06b756a882dcafbfd SHA-1: 2a055b759d3d1a41dab7ebfa04fb1475fb4f5e62 SHA-256: f8920c0fa961e98a906694eb021c12cc9f35d3b4e4ae9a095e12c61dc5e896e1
184 Risk Score

Malware Insights

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

The PDF file contains a lure related to fixing an LG washing machine, which redirects to a known malicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL is the primary indicator of compromise, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+fix+lg+washer+not+spinning In PDF document text
    • https://cdn-cms.f-static.net/uploads/4445326/normal_600b7386a9156.pdfIn PDF document text
    • http://nuzupamumobal.22web.org/73705530386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414867/normal_5fe751e7298bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481282/normal_60329ad4b3931.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e51fbd5-03df-409c-adf5-71decb8d5129/45188116722.pdfIn PDF document text
    • http://guduxakif.rf.gd/emulator_nes_android_apk.pdfIn PDF document text
    • http://tinanatibora.rf.gd/does_a_vaporizer_help_with_emphysema.pdfIn PDF document text
    • http://dogurof.epizy.com/photos_slideshow_after_effects_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37bb2582-6f22-4c1b-b872-8e126aad23ef/nuresewoxemusigimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bd37654-282a-4040-8791-341c16711d1b/msi_h270m_bazooka_ram_compatibility.pdfIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_40922076c6d74eb3a64ce8b7d24ccbe8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bb43706-94c0-44ea-92ad-8934b752e28e/gapofubajexop.pdfIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_65424becdf40463ea79a784f448ce17c.pdf?index=trueIn PDF document text
    • http://molodetagako.epizy.com/meguwogujujel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fb7ed4f-b8da-44f8-87c2-1fe6515bf5e8/64571250664.pdfIn PDF document text
    • http://jurigixa.rf.gd/nafuxesomobepubigewa.pdfIn PDF document text
    • http://wewodis.rf.gd/zinisozedesitudi.pdfIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_04d22cdd26b5423ebafd3e19a61b736a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fd7c84f-54d0-4fb1-874c-bbcd665cefda/buku_plato_timaeus_and_critias.pdfIn PDF document text
    • http://birofasadonu.epizy.com/guild_wars_2_necromancer_leveling_guide.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_22bb8991064d46bdba0c5c001ad358c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f25ec9b-d4ee-4dac-a5fd-a1d019c1775f/harry_potter_and_the_goblet_of_fire_movie_plot.pdfIn PDF document text
    • http://bakisuv.rf.gd/50582877400.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_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 5284 bytes
SHA-256: d963b6020965c6f74306d981281745e29fdfd6b9c442df423595e77a9808a538
font_01_sfnt_off00010003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 10240 bytes
SHA-256: bfd47bb9e60fd41fb31475c99146b14a3bdf0e0d9000a0888a006944567e8fd9