Malicious PDF — malware analysis report

Static analysis result for SHA-256 def47452a6cef768…

MALICIOUS

PDF

71.6 KB Created: 2021-02-16 02:13:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fa8380fb3854f40a8639e3c981ecb4cc SHA-1: e76e0c1cc083558693546d245eb022127bd6e15d SHA-256: def47452a6cef7686daff6efb7762eed97b0ab696813a1991c9ec2f856eb705f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF document that contains numerous external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The heuristic 'SE_MFA_LURE' indicates the document is designed to harvest credentials or abuse multi-factor authentication. The presence of embedded URLs and the ML classification strongly suggest malicious intent, likely for phishing or malware distribution.

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
  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://baarspo.ru/strik?utm_term=how+to+setup+linksys+e1200+without+cd PDF link annotation
    • https://cdn.sqhk.co/lamiwifa/al9Mgig/71129582245.pdfIn PDF document text
    • https://kiloxuloje.weebly.com/uploads/1/3/5/3/135398856/zazanefusig.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/gvggsZO/11378155058.pdfIn PDF document text
    • https://sedapelagug.weebly.com/uploads/1/3/4/1/134109100/653783f553c037b.pdfIn PDF document text
    • https://cdn.sqhk.co/gogoturowib/JpqigVX/18441247771.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/nowokil/xuviperulekozodaligebavu.pdfIn PDF document text
    • http://nesitojogosew.epizy.com/ccs_c_compiler_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/gukozadu.pdfIn PDF document text
    • http://gadoxijumulop.epizy.com/wujadenibuvuzativ.pdfIn PDF document text
    • http://kepinud.rf.gd/pre_control_chart_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/android_x86_vmware_install.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/77501781349.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/miwedosusiwesid.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/selolusaxibos.pdfIn PDF document text
    • http://dukifubu.epizy.com/protibad_bangla_movie_hd.pdfIn PDF document text
    • http://joketatam.epizy.com/most_beautiful_nature_images.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_off0000dc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC30 5400 bytes
SHA-256: d3385e1b0f422f57104784585b9403b5ba4bd88dd7644c769e71a254671f9e64
font_01_sfnt_off0000eeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 10224 bytes
SHA-256: f0550e0bd7c455fe54a6735521f6f45447345140f18a01786c6a0ad255c5f3c5

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