Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c8dc72678069f5…

MALICIOUS

PDF

84.4 KB Created: 2021-06-02 09:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: de8a521912d11086a7ae87f14df95522 SHA-1: c597bfb1461919bccc5b11dc3870a52b874411dd SHA-256: 42c8dc72678069f5e7a99240cef929c0ad8e2ed858d2b8113c481fefe833c9ac
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 likelihood of malicious intent. The document body, though heavily obfuscated, contains a lure related to Amazon Fire Stick remotes, and the file contains a large number of external links, many hosted on disposable domains. This suggests the PDF is part of a link farm designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://synerhu.ru/pbw?utm_term=amazon+fire+stick+remote+not+working+with+new+batteries PDF link annotation
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/6960a83.pdfIn PDF document text
    • https://vevabute.weebly.com/uploads/1/3/4/2/134265428/kijekuvukebesatobak.pdfIn PDF document text
    • https://sasadopebob.weebly.com/uploads/1/3/5/3/135324308/b0779de96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446035/normal_60067fcde449d.pdfIn PDF document text
    • https://tineminelebon.weebly.com/uploads/1/3/1/6/131606156/zikifu-rerokag-bejuloso.pdfIn PDF document text
    • https://robiduvasolowa.weebly.com/uploads/1/3/4/6/134657162/86bc1db4a.pdfIn PDF document text
    • https://jodawozuwiki.weebly.com/uploads/1/3/1/4/131437728/vukanorapitoxumixad.pdfIn PDF document text
    • https://kasababafaraw.weebly.com/uploads/1/3/5/3/135336348/384df5a47326110.pdfIn PDF document text
    • https://virigegeke.weebly.com/uploads/1/3/2/7/132740897/5028406.pdfIn PDF document text
    • https://xumejiti.weebly.com/uploads/1/3/4/5/134529375/3722091.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450151/normal_603e5095514d1.pdfIn PDF document text
    • https://milanabez.weebly.com/uploads/1/3/2/6/132695465/wafaruravomopute.pdfIn PDF document text
    • https://rozinefowo.weebly.com/uploads/1/3/4/5/134576391/eef4f16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485161/normal_6066f99f8aedc.pdfIn PDF document text
    • https://wuginimujewege.weebly.com/uploads/1/3/4/7/134714977/pulakuje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495837/normal_6032a598c3f58.pdfIn PDF document text
    • https://kaxepiset.weebly.com/uploads/1/3/2/7/132740291/safewoluku-dagatesajek.pdfIn PDF document text
    • https://kuvakikarubefi.weebly.com/uploads/1/3/1/3/131383404/6acf7.pdfIn PDF document text
    • https://kozegefiseram.weebly.com/uploads/1/3/1/3/131379202/lafixose_mupopigipiwoxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404959/normal_5ffd205c1704c.pdfIn PDF document text
    • https://www.truemark.dev/ScrumIn 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/4af7af9e-48a8-4e66-aaa8-a880c606d3b2/33106280101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff3a24c4-760b-4560-b8b2-150389a04d5b/what_is_a_scouts_salary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8daf34c-c300-42c9-8772-7410773e16d9/take_the_stairs_rory_vaden_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a1e2f5e-66cf-460b-bbd2-8170354ff4b5/sevopagurifa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a918653d-79f2-40b2-9ac1-6270007d7831/66116226289.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_off00010ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA2 5600 bytes
SHA-256: a98cf7a04c48b359d4aa69cb4963cc65becdba0ccc46e729b20efd1c79953e9f
font_01_sfnt_off00011ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA8 10780 bytes
SHA-256: 229ec69afe6f61060f1545f30e3a5169942f4c28f155ed189329ac435afc5cde

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