Malicious PDF — malware analysis report

Static analysis result for SHA-256 7916392c414a86f5…

MALICIOUS

PDF

119.3 KB Created: 2021-02-15 06:30:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 04ef3f3217cd5978e2f47b5791ecfea0 SHA-1: cfeca8e1f30f61d821691e3f551bf7b74ab30657 SHA-256: 7916392c414a86f5d6b9533770fc0d76ce179078e5008bba5ab9d35789bd0786
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wb?keyword=cartesian%20vector%20form%202d PDF link annotation
    • https://xujikipige.weebly.com/uploads/1/3/1/3/131379844/2782f1ac.pdfIn PDF document text
    • https://kajubuti.weebly.com/uploads/1/3/2/6/132680994/zotojifafegixiwuwod.pdfIn PDF document text
    • https://katabeguravaka.weebly.com/uploads/1/3/1/4/131407194/mubiwogaxuledi.pdfIn PDF document text
    • http://maroron.22web.org/cengagebrain_accounting_answer_key.pdfIn PDF document text
    • http://salea.site/afk_arena_promo_codes_september927df.pdfIn PDF document text
    • http://wirodapupoz.iblogger.org/17679443114.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/3596e1dc7f.pdfIn PDF document text
    • https://tusululobiwivet.weebly.com/uploads/1/3/1/1/131163859/9212076.pdfIn PDF document text
    • http://kobasobapina.22web.org/deductive_reasoning_worksheet_with_answers.pdfIn PDF document text
    • https://vijisazegogufob.weebly.com/uploads/1/3/1/3/131380966/kepurugito-sugixi-patebig-jomazejividam.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/ligole/lumesaxizemigivepera.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/iupac_harmonized_guidelines_validation.pdfIn PDF document text
    • http://kadimupekomo.rf.gd/pip_camera_photo_editor.pdfIn PDF document text
    • http://negavutagogo.epizy.com/netflix_apk_hack_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/billionaire_casino_cheats_android.pdfIn PDF document text
    • http://sarebabeb.epizy.com/volowumelotoxalegikisuti.pdfIn PDF document text
    • http://kegeduwamid.epizy.com/almanaque_turma_da_monica.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
    • 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000168ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168AD 5232 bytes
SHA-256: 719b26f72b9ed0fae22462a5c9d269a48f76e04c9e87db82b2a2501e6f2163a0
font_01_sfnt_off00017a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A6A 14264 bytes
SHA-256: 513549ce7969962c1c252f461bafbcad0443101d13915cdd6c834dbe946caad2
font_02_sfnt_off0001ab02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB02 16112 bytes
SHA-256: ec41c30fd9019f3178924d45c8d69ef4e47797bcb284940c506eb46a5b42a3e4
font_03_sfnt_off0001bfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFE7 6084 bytes
SHA-256: f5fe2de525700542684e23a11f1cb185b9ffab030677c6a48f3d5a1088c9e53b