Malicious PDF — malware analysis report

Static analysis result for SHA-256 7550117d90885197…

MALICIOUS

PDF

81.7 KB Created: 2021-01-17 23:54:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: aadbb2c0ce97f8955e3574dda7648644 SHA-1: c4d50550dc1a87e0fe2a330d906ccaf7f62b5844 SHA-256: 7550117d90885197db9aea22df6f7f8d6621430fb0ded4eeea835faa5901b8d8
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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.
  • 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://traffnew.ru/123?utm_term=m%2526m+video+games+largo PDF link annotation
    • https://vaputonusodi.weebly.com/uploads/1/3/4/4/134493057/78bafdc.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/iy8hhBz/unicorn_photo_backdrop_diy.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/nggkagh/44201477838.pdfIn PDF document text
    • https://wexemexaxixu.weebly.com/uploads/1/3/4/7/134709907/f066965fe9a.pdfIn PDF document text
    • https://fodewifejala.weebly.com/uploads/1/3/4/4/134491976/1753301.pdfIn PDF document text
    • https://buralekareze.weebly.com/uploads/1/3/4/3/134326789/tuzudosan_zogakulon.pdfIn PDF document text
    • https://nigikejogu.weebly.com/uploads/1/3/4/9/134902550/3a450add.pdfIn PDF document text
    • https://joxorarosod.weebly.com/uploads/1/3/3/9/133999743/414b61e7e.pdfIn PDF document text
    • https://cdn.sqhk.co/salefudodid/gJxzjd5/fear_the_walking_dead_season_5_finale_date.pdfIn PDF document text
    • https://cdn.sqhk.co/sepunaro/i5mjgmF/the_cook_3d_cooking_game_online.pdfIn PDF document text
    • http://lazadoso.iblogger.org/topographic_profile_practice_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gesesasogibigaw.rf.gd/edmodo_apk_para_ios.pdfIn PDF document text
    • http://wefazor.epizy.com/3691803636.pdfIn PDF document text
    • http://fawivemepogu.epizy.com/cinema_paradiso_sheet_music.pdfIn PDF document text
    • http://topemuzopapegu.epizy.com/6th_grade_worksheets_social_studies.pdfIn PDF document text
    • http://bidetorula.rf.gd/lagu_dot_belahan_jiwa_cover.pdfIn PDF document text
    • http://mazogatu.epizy.com/brother_kodaline_song.pdfIn PDF document text
    • http://najubizep.epizy.com/47372776133.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
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40B 3488 bytes
SHA-256: 3f8ba532f425859a8fbee395ccb55d4fcc57585e0cb9ebd0f5a76bb2a8b21098
font_01_sfnt_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 6196 bytes
SHA-256: 9a4a33c3ec783faedc7e7bfb3c432c2e0d92fda1f9f2a996f47236ab3badbb94
font_02_sfnt_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 12072 bytes
SHA-256: 844cff54ca3a7f6a521c864d77999ce2a687102d2499084d8603169296de43bd
font_03_sfnt_off00011566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11566 16060 bytes
SHA-256: f3b9ce5085d11cb912f5f7d08ee1bae85535b766da7550e04fe9540ed2abc315
font_04_sfnt_off000129f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F8 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3