Malicious PDF — malware analysis report

Static analysis result for SHA-256 307e2503fe5a5aa7…

MALICIOUS

PDF

114.5 KB Created: 2021-03-22 12:00:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 52813b7ae6a8862959e9d76c5f804742 SHA-1: 7e422b6871f54ca7de88e4d3be70bab11ab27d59 SHA-256: 307e2503fe5a5aa7a48062a467cc197bde385aac4e043278019d2fa01e7bf729
126 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified as a link farm. The primary malicious activity appears to be directing users to various websites, including suspicious domains like 'nipisod.ru'. While no scripts were directly extracted, the PDF structure and heuristic firings suggest an attempt to manipulate search engine results or redirect users to potentially harmful content. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://nipisod.ru/strik?utm_term=skinny+fat+body+type+male PDF link annotation
    • http://jifarobajis.sportsontheweb.net/what_percent_of_scouts_make_eagle.pdfIn PDF document text
    • https://cdn.sqhk.co/razotefo/jlgjNje/game_for_cats_ipad_free.pdfIn PDF document text
    • https://cdn.sqhk.co/pafatewodoju/jgoibgf/off_road_track_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/ijjiiji/verugolijiwiriruwas.pdfIn PDF document text
    • https://cdn.sqhk.co/xipapotug/gfCRZrQ/52019057216.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/haN7geT/satorilimixosotexu.pdfIn PDF document text
    • https://cdn.sqhk.co/gabisolovima/W9ewigJ/wusibipedivikip.pdfIn PDF document text
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/0abe188875996d9.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/3MDyic4/rodilujakasu.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/f9o6Mjh/96645748614.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/ciieShj/57494858422.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/assertive_communication_book.pdfIn PDF document text
    • https://bewanabexujafo.weebly.com/uploads/1/3/6/0/136050633/7a56b7d43478196.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/capital_letters_in_english_exercises.pdfIn PDF document text
    • https://fazukowabawubi.weebly.com/uploads/1/3/1/4/131407802/denomuludunepo.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://wolobugoxew.myartsonline.com/staples_mailmate_m3_shredder_manual.pdfIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_101d287f2b3846c29fdc322ef2515048.pdf?index=trueIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_2a99bb256ed1469ebff0841ae414490e.pdf?index=trueIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_2426651a24194884aa6ecfc6c2c8a7f4.pdf?index=trueIn PDF document text
    • http://vakogez.myartsonline.com/99355630449.pdfIn PDF document text
    • https://badbb018-ab4e-499b-b788-960949b82e3d.filesusr.com/ugd/4f4c56_0b44bb8461b74e22b06cb6957842a30b.pdf?index=trueIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17419 5108 bytes
SHA-256: 68977272e45a40c600bfc01bb96a090af948ca64999a8d421a834cb98cc25099
font_01_sfnt_off00018566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18566 11508 bytes
SHA-256: de2dd7a432e9a85d8cfcbfb35e92b7ab8fdf11b48496c7669db22acca1b4f69f
font_02_sfnt_off0001acbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACBE 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e