Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77747b17acf72c4…

MALICIOUS

PDF

83.9 KB Created: 2021-03-01 18:25:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 750387cf52ef5f8692020b4264c3d31f SHA-1: c7178621a6052bd96816009bdba98457c3131541 SHA-256: a77747b17acf72c4d12ba29fe66aede45d9a62d9607e375873989bf6e7101518
184 Risk Score

Malware Insights

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

This PDF document exhibits malicious characteristics, primarily through its extensive use of links pointing to disposable domains and redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=audio+technica+lp60+usb+black+usb+turntable+with+audacity+software In PDF document text
    • https://dikijezirepa.weebly.com/uploads/1/3/2/8/132815872/mivilexivilozawumuk.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/wivitofegajuxej.pdfIn PDF document text
    • https://makaxifosezopuv.weebly.com/uploads/1/3/4/5/134511124/pokufikonidigisowi.pdfIn PDF document text
    • https://wokabilizivamu.weebly.com/uploads/1/3/2/7/132712023/bisapebubeso.pdfIn PDF document text
    • https://nesipemuwazona.weebly.com/uploads/1/3/4/8/134881126/fbb253.pdfIn PDF document text
    • https://suwudaxodorepe.weebly.com/uploads/1/3/4/8/134885248/sedarixitagi_mojuk.pdfIn PDF document text
    • http://tuwukadinem.mygamesonline.org/jijenimofokaduxosopimo.pdfIn PDF document text
    • https://tepidupelagoxu.weebly.com/uploads/1/3/4/4/134472529/xugiko.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/first_grade_math_standards_cheat_sheet.pdfIn PDF document text
    • https://zemedabumudog.weebly.com/uploads/1/3/2/7/132712209/terokina-gifupuk-zazaxikow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xazexunipix.epizy.com/12124288557.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/is_bissell_crosswave_good_for_pet_hair.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 5924 bytes
SHA-256: f30b964e3b74a8fbdf3bf9cb16ca41a01fa92a7057e5df5ebc302828428f4aaf
font_01_sfnt_off0000fde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE7 14596 bytes
SHA-256: 3b8b9ef8c8ff2a829e9a59729feea855f113e8054e1b6a1fcf03e4f10dac827c
font_02_sfnt_off00012c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C14 16328 bytes
SHA-256: 78493034c033d0861782d53997b784eeb14f7cecaab48b0f43681cd7da4d5e88

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