Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe79d1510dbf1ed5…

MALICIOUS

PDF

77.0 KB Created: 2021-03-10 21:58:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a60351225c38bbf1bf34267f2c81a50 SHA-1: 17643525bc4e7df1b629e45c576c7f9bd8f314a6 SHA-256: fe79d1510dbf1ed514888589c7146c31a6d246a6d86f3e0baef238860a4d1de8
96 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a 'PDF_SEO_LINK_FARM' indicating a large number of external links. The embedded URLs point to various PDF files hosted on different domains, suggesting a link farm or a distribution mechanism for further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://golowaki.ru/aws?utm_term=how+far+can+cobra+walkie+talkies+go
    • http://wopizup.mypressonline.com/15571953667.pdf
    • http://forovasax.medianewsonline.com/dadaripowil.pdf
    • http://duwosolutanuz.mypressonline.com/harry_potter_and_the_half_blood_prince_game_trailer.pdf
    • http://tideparipawovu.mygamesonline.org/types_of_stereoisomers.pdf
    • https://cdn.sqhk.co/xodokopav/d0aIijG/zisipexukabifafafodi.pdf
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/b3372f4083c5ec.pdf
    • https://kujopupij.weebly.com/uploads/1/3/0/7/130740053/3339600.pdf
    • http://vasakuso.sportsontheweb.net/dilajovawakofowefoni.pdf
    • https://topirameji.weebly.com/uploads/1/3/2/6/132682330/pifeje.pdf
    • https://cdn.sqhk.co/rasepotobami/jZHYRje/notatone.pdf
    • https://cdn.sqhk.co/lididiregi/iiPhfij/space_movie_1992.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://saxodanokijaj.atwebpages.com/what_is_the_best_food_saver_vacuum_sealer_to_buy.pdf
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_c3f83244b56f4e51854ff84a11731dda.pdf?index=true
    • http://sodowurivav.onlinewebshop.net/sajiduf.pdf
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_8a78eed9fa7d49bb83824d0d6e43486a.pdf?index=true
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_948ed9ee8cad4952a0162e2bdbb1a10a.pdf?index=true
    • http://bufijonewufo.onlinewebshop.net/chronicle_of_a_death_foretold_shmoop_chapter_1.pdf
    • https://uploads.strikinglycdn.com/files/5fa9d417-afca-4fea-97ed-47fa889bdb5a/how_do_i_fix_hp_officejet_pro_8610_missing_or_failed_printhead.pdf
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_7a430d96a64a464b8eec41accf82f53f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3ccb9440-d4e6-47b7-8ef2-72f68e383fe0/old_employees_synonym.pdf
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_d9ad27a3a6824d389837ea2c04d29385.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef01.bin
3163fc04631b1083287ca1de7a4bfc443687e267c6d19d781171cb4ad15e9cb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 5308 bytes
font_01_sfnt_off00010130.bin
0436ea1444447e2745779f7343fc966f7cd867960c472d5f579fb148cc1ba3d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10130 10996 bytes

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