Malicious PDF — malware analysis report

Static analysis result for SHA-256 55556425dfd7a122…

MALICIOUS

PDF

72.3 KB Created: 2021-06-05 19:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 57c7468b356543c656b3a2490fdddea6 SHA-1: 09861e7e8bf3b417d9c23038e9796e8f1f8d4379 SHA-256: 55556425dfd7a122397b09a43cfb9a8c713d15c598c615f99969e81b1f065749
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to Uber, aiming to trick users into clicking on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://irlanc.ru/pbw?utm_term=how+to+use+uber+without+mobile+app+first+time PDF link annotation
    • https://senuwisaf.weebly.com/uploads/1/3/4/0/134018119/8725809.pdfIn PDF document text
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/zifuvoberasijab-lewawo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366350/normal_5ff7ab0269f10.pdfIn PDF document text
    • https://vatewiwep.weebly.com/uploads/1/3/4/4/134482367/7255098.pdfIn PDF document text
    • https://kigodebilak.weebly.com/uploads/1/3/5/2/135297846/maripuwoxope-nuladigoramased-sesagijirapopu-bedizivosovaneb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423148/normal_605181a138a9e.pdfIn PDF document text
    • https://kalabuzamebuku.weebly.com/uploads/1/3/4/3/134339718/6228901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402707/normal_60145a8d86346.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471250/normal_5fdbb5439174b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415291/normal_5ffe065978ab0.pdfIn PDF document text
    • https://senuwisaf.weebly.com/uploads/1/3/4/0/134018119/495110a.pdfIn PDF document text
    • https://mefarixikokupa.weebly.com/uploads/1/3/4/7/134759110/menoxuteganegid.pdfIn PDF document text
    • https://duxizesojisuvab.weebly.com/uploads/1/3/5/3/135327590/90535039.pdfIn PDF document text
    • https://xinorexuvon.weebly.com/uploads/1/3/4/6/134608307/cefc62d806820a.pdfIn PDF document text
    • https://fadurobudafeme.weebly.com/uploads/1/3/5/9/135959894/84426b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427544/normal_60111d0285358.pdfIn PDF document text
    • https://fanizoliboligom.weebly.com/uploads/1/3/1/0/131070566/1735962.pdfIn PDF document text
    • https://pilinosaw.weebly.com/uploads/1/3/4/8/134852056/5258498.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/690b2a85-3869-4f5b-8d8f-9018c04a8ead/what_are_the_five_types_of_imagery_in_literature.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e7a59a6-bfba-49e2-add4-b93176adf49e/58706825225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aefd986d-1660-4407-bac5-1723d352cfc2/el_rey_del_tomate_cast.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_off0000de10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE10 5336 bytes
SHA-256: 45b0c1bc1376d587c753b24fa28ad322975bde08cac83ce8575f9c440b211ee0
font_01_sfnt_off0000f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 10420 bytes
SHA-256: 4be893521e1a96eda612d12f863839b02883d2da457696b9a122eb92f82aa3d6