Malicious PDF — malware analysis report

Static analysis result for SHA-256 b749387395d100f4…

MALICIOUS

PDF

86.8 KB Created: 2021-03-30 05:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48bd627b9af20021400a5b89e6e796fe SHA-1: 2c1fc2722276ac06ab941e88c67a6d7a493fde14 SHA-256: b749387395d100f4674d4ece98eab0e0bdf9e55692c003c2107a6286114a1354
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO link farms or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and trojan activity. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to potentially harmful content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/123?utm_term=predicate+adjective+worksheets+with+answers
    • https://static.s123-cdn-static.com/uploads/4366341/normal_5fdf4c973b80e.pdf
    • https://static.s123-cdn-static.com/uploads/4422906/normal_5fef4271d22c9.pdf
    • https://cdn-cms.f-static.net/uploads/4420747/normal_6046dc21db506.pdf
    • https://cdn-cms.f-static.net/uploads/4413238/normal_6013bd120aaac.pdf
    • https://cdn.sqhk.co/daxerarugak/hejh3hf/venus_fly_trap_care_uk.pdf
    • https://cdn.sqhk.co/duvapegoleva/c6heyCy/good_dinner_places_near_me_now.pdf
    • https://cdn.sqhk.co/reditifotep/9gfijgj/bitisadal.pdf
    • https://cdn.sqhk.co/moxulofilose/l5gcUjd/rec_screen_recorder_hd_download.pdf
    • https://cdn.sqhk.co/vakolitakap/igfh7iO/prison_wrestling_revolution_2020_3d.pdf
    • https://cdn.sqhk.co/fevazufalul/VqNIZhg/73797133153.pdf
    • https://cdn-cms.f-static.net/uploads/4490961/normal_6049d4ec5abab.pdf
    • https://cdn.sqhk.co/razefudixid/fjuibgh/pdf_split_merge_windows_7.pdf
    • https://cdn.sqhk.co/rozesivotix/niijfjb/35393095098.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_48231c7580a84407997106fe81fa6277.pdf?index=true
    • http://pumejak.rf.gd/teknik_hedging_forex.pdf
    • https://s3.amazonaws.com/rimejiguvif/pbis_check_in_check_out_sheet.pdf
    • https://s3.amazonaws.com/doxifuba/bloons_td_battles_5_apk_mod.pdf
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_bb9d062b5ef3426590a5c0aa0354a106.pdf?index=true
    • http://magisavupuwikiv.rf.gd/14987310170.pdf
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_73a60711fc744e87ba9795c24abdb391.pdf?index=true
    • https://s3.amazonaws.com/wupixufekijax/kixij.pdf
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_0da27942216c4792997c3d601ebb3d30.pdf?index=true
    • https://s3.amazonaws.com/zidosozawok/startup_food_business_plan_sample.pdf
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_80279ce6a0f949ec8773d60bed2f5ff5.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fda5.bin
d296e9609eeb1485f9f546e69daa95e53f36035f0efbab73377824fe26c2c2c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA5 5288 bytes
font_01_sfnt_off00010fb2.bin
1682a18c24c3d147d95cddc4c3e34111b78509177efcd27e452faff011264c8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB2 11152 bytes
font_02_sfnt_off000135f9.bin
bbdabb00aa34f830ea5f748abf4797e357d31dccc86728227518c1a77436c6c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135F9 16604 bytes

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