Malicious PDF — malware analysis report

Static analysis result for SHA-256 194b403e794dbcc6…

MALICIOUS

PDF

79.9 KB Created: 2021-04-01 00:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: cc9ff4ac1302b03c5c12aaad9258cb45 SHA-1: 27ab55ef9b4275a3d255f9bdc9a334c824800fde SHA-256: 194b403e794dbcc6445d87e8a35ef7c0fb0e21941141abc4f6b1f70aab6d3e6a
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to malicious sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML classification strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/award?keyword=high+carb+foods+list+pdf In PDF document text
    • http://fijigud.22web.org/kugepoduxafosox.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/amoeba_sisters_food_web_answerstqyid.pdfIn PDF document text
    • http://chambreapp.xyz/zukegepuxagezadaa3hs1.pdfIn PDF document text
    • http://lusejifunod.22web.org/kafukiburozitugov.pdfIn PDF document text
    • http://nosinoski.shop/assertiveness_training_exerciseserybm.pdfIn PDF document text
    • http://musc-media.xyz/the_secret_of_ages_booktpf01.pdfIn PDF document text
    • https://liwavijej.weebly.com/uploads/1/3/4/3/134379327/1016739.pdfIn PDF document text
    • http://lordtrans.ru/stephen_king_the_stand_miniseries_1994_streamingskjfm.pdfIn PDF document text
    • http://coloradocustomelectric.com/895334623217f10y.pdfIn PDF document text
    • http://fitdieta.com/lasagna_sheets_without_pasta_makernadgo.pdfIn PDF document text
    • https://zazafiwizodizi.weebly.com/uploads/1/3/4/0/134041258/jevivajadarut.pdfIn PDF document text
    • http://mavpa.fun/97522564855ymeqr.pdfIn PDF document text
    • http://winoraama.fun/47115268297pkpee.pdfIn PDF document text
    • http://vpntop.info/37111506685obi8l.pdfIn PDF document text
    • https://varupeneg.weebly.com/uploads/1/3/0/9/130969993/7225933.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kobamozikepaxip.rf.gd/13779358220.pdfIn PDF document text
    • http://biranon.rf.gd/26620597005.pdfIn PDF document text
    • http://dotenax.rf.gd/tipos_de_metabolismo.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_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 5516 bytes
SHA-256: 773e21e31758f1a1f9e4c75c1ab4c6494b8c72db018222f7b90accd29f6d5afb
font_01_sfnt_off00010ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC6 11360 bytes
SHA-256: 5e3e38d796da57837f19cdc3ca97af94792fde301dc848cc66920e179af4b732

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