Malicious PDF — malware analysis report

Static analysis result for SHA-256 0626e792ab3f4cf2…

MALICIOUS

PDF

65.1 KB Created: 2020-12-15 01:13:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e77ece749f21cd1924d146d1b529573 SHA-1: d34596cea3d906cd07351f72bed448375a1e493a SHA-256: 0626e792ab3f4cf258235bf76fc71d9f32e5e0516f8ae85b3837df43a73bedf0
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link to known malicious infrastructure. The document contains a large number of embedded URLs, many hosted on disposable domains, which are likely used to lure victims to phishing or scam content. No scripts were extracted, but the presence of numerous malicious redirectors strongly indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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 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://ggtraff.ru/123?utm_term=coot+decoys+for+sale
    • https://kekulepolunan.weebly.com/uploads/1/3/4/8/134889268/4616333.pdf
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/954920f9.pdf
    • https://federadedeladol.weebly.com/uploads/1/3/4/6/134626130/zisadupufi.pdf
    • https://biwugina.weebly.com/uploads/1/3/1/1/131163984/fosaneku_relujiruzu_lerezimiti.pdf
    • https://fekujize.weebly.com/uploads/1/3/4/8/134869517/331013.pdf
    • https://tuluseso.weebly.com/uploads/1/3/4/7/134718642/bitagifilerujudowuzo.pdf
    • https://tariroviwobin.weebly.com/uploads/1/3/4/7/134715354/a98b82792a08fd.pdf
    • https://kozowesojufeg.weebly.com/uploads/1/3/4/7/134717080/b7e318ef9924.pdf
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/jawemepuwiwifisuluf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/matogapibelifiv/biology_101_laboratory_manual_answers.pdf
    • https://static1.squarespace.com/static/5fc0dd9b8ef7301f8b108504/t/5fc13b863570fb44d12fb4f8/1606499206654/12942286122.pdf
    • https://uploads.strikinglycdn.com/files/1972aee4-1c9f-4d09-b67e-3c4aac41a8cf/witizopa.pdf
    • https://static1.squarespace.com/static/5fce46ecea95a9497c06388c/t/5fd74e2613a48350e82ef622/1607945766943/train_ticket_reservation_form_in_excel.pdf
    • https://s3.amazonaws.com/tomaxade/fat_chef_mug.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000beba.bin
504ca766bb1c1dafa3088a13b1c9b590a054742edaa8affddd195e8690d97565		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBA 5020 bytes
font_01_sfnt_off0000cfe4.bin
3af206cb13296aa803c93980f83e9dfe7e9967d0844a62390746d761cc423425		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE4 11752 bytes

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