Malicious PDF — malware analysis report

Static analysis result for SHA-256 43af473d4cc7b025…

MALICIOUS

PDF

103.6 KB Created: 2021-02-22 08:40:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cbabc2a56bc57c96594f7108fcc5aa96 SHA-1: 5c10b15ee4732c2d7419161c87b3fce615c30ec1 SHA-256: 43af473d4cc7b02586cd80ca9f79ac6e6a4f5f5483b3b1232bb06838df9a6ad6
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to be a lure related to a common search query, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/strik?utm_term=what+is+the+difference+between+dewalt+20v+max+and+20v+xr In PDF document text
    • http://creditactive.info/bifarubefugetusamagf8ll.pdfIn PDF document text
    • http://xupenirulavep.iblogger.org/17389790304.pdfIn PDF document text
    • http://saletipaja.22web.org/carousel_bootstrap_template.pdfIn PDF document text
    • http://izzzaaa.space/pasixobirutivagct5c.pdfIn PDF document text
    • https://biwasigefo.weebly.com/uploads/1/3/1/3/131398444/5684432.pdfIn PDF document text
    • http://blekrossi.ru/numerical_expressions_worksheet_6th_grade5pcz0.pdfIn PDF document text
    • http://getveran.site/the_natural_rate_of_unemployment_equal_to_zero1qkff.pdfIn PDF document text
    • https://zegesunipatobas.weebly.com/uploads/1/3/1/3/131379774/pijasataxexo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/bajoferekupedewised.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/judilowuj.pdfIn PDF document text
    • http://dukizovisepo.rf.gd/47447116611.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/wekajoradejiroli.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/54417951960.pdfIn PDF document text
    • http://fudajajekibow.rf.gd/loxokobu.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14309 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off000152fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152FD 5908 bytes
SHA-256: dca5d982747f83070fee27345ac71eafbf935293bb445a4a460ea70e1881866e
font_02_sfnt_off0001670f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1670F 12268 bytes
SHA-256: aaa740e5bd557abb287e375f2ee4a40c176fe01b5722c650b1e11e78ddb53b94

Open this report in the interactive analyzer, or submit your own file for analysis.