Malicious PDF — malware analysis report

Static analysis result for SHA-256 178aafeaca071354…

MALICIOUS

PDF

78.2 KB Created: 2021-03-18 04:17:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8b6d7fd0fedb164497a6003b3dd486ed SHA-1: a56ec733a84b03d26ea5e6f809dee6f7800ccc91 SHA-256: 178aafeaca071354000f37d6f69ee9014f8cdb4e9346d6bd2eceb1028f21111d
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One URL is identified as a known malicious redirector, and another heuristic indicates a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

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
  • 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 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.
  • 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://dafemum.ru/strik?utm_term=comparatif+superlatif+allemand+liste In PDF document text
    • http://gutagige.sportsontheweb.net/agatha_christie_books_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vudupapuj/gcs0TFK/77722892519.pdfIn PDF document text
    • https://jasesokotu.weebly.com/uploads/1/3/4/4/134499989/4745391.pdfIn PDF document text
    • https://cdn.sqhk.co/kogeledewafo/egcifmu/spotlight_room_escape_losung_kapitel_2_level_1.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/egdlQjg/wofatoke.pdfIn PDF document text
    • https://bogezozoxo.weebly.com/uploads/1/3/4/4/134479702/veseje.pdfIn PDF document text
    • https://cdn.sqhk.co/dodagirojep/gUghohb/entrepreneurial_mindset_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/eIC6hjT/pop_music_playlist_clean_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/neseleko/jjiENij/learn_thai_alphabet_writing_worksheets.pdfIn PDF document text
    • https://kunamugak.weebly.com/uploads/1/3/0/7/130739026/poverunek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuvuvadut.onlinewebshop.net/96420942433.pdfIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_7437ea13b65d496b966785d672614c0a.pdf?index=trueIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_365f09816725493bab8c121c35ad0db4.pdf?index=trueIn PDF document text
    • https://154530d8-637b-49d0-b90a-43bf07a176fb.filesusr.com/ugd/59359a_63783b1f4e6041209ad6f3305b178fd2.pdf?index=trueIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_6f712f2d02f947bc8547a016671e5812.pdf?index=trueIn PDF document text
    • https://75edee45-cd08-43cb-a752-0c33e5c2343f.filesusr.com/ugd/a7c173_8c9abb475acc42eab10613f0c71acaa5.pdf?index=trueIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_fc6a329815e941798d508b5072fd1ef5.pdf?index=trueIn PDF document text
    • https://d1ced4a1-fa29-4c66-b583-77209f32159a.filesusr.com/ugd/c88d8b_d48f2548f7ab4416b076d0d40fd6ab64.pdf?index=trueIn PDF document text
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_324cb67f37d24ef98909837461fc6992.pdf?index=trueIn 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_off0000f031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 5092 bytes
SHA-256: 4d2b0c8863abded9ec2180e08715da5a33dac4b7a523212bc3c97c4fc0fd2ba1
font_01_sfnt_off00010160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10160 13120 bytes
SHA-256: aff7a82a6e5e2e283e6fdba941ea7e2abf4af484b6a6f2a6c8a7484d22c7c4f8