Malicious PDF — malware analysis report

Static analysis result for SHA-256 07973bcfa585dd1e…

MALICIOUS

PDF

102.1 KB Created: 2021-03-18 18:36:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 21802edbeeeb3c5d1ddb1c44146c4312 SHA-1: 9b63d8ba6ccb0d71dcf0a710f4634386fc741f8d SHA-256: 07973bcfa585dd1e7d5519e3915c86e7d7fdbe563b9a2f9c8b2e3993d8d8dfc2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://mezovuduw.ru/123?utm_term=elsword+daybreaker+guide PDF link annotation
    • https://cdn.sqhk.co/baxemazisod/icxhiHh/12193105736.pdfIn PDF document text
    • https://cdn.sqhk.co/datimemovuko/3HNOXaU/62932178840.pdfIn PDF document text
    • https://cdn.sqhk.co/pufuxogife/ihfjcO5/adventure_capitalist_ez_upgrader.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/HifNibr/sky_raider_hearthstone.pdfIn PDF document text
    • https://cdn.sqhk.co/wirubetena/ji1jehj/notuva.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/jcujlt6/vurelofato.pdfIn PDF document text
    • http://bubobimurasawe.iblogger.org/retin_oil_the_chemistry_brand_24__les_100_ml.pdfIn PDF document text
    • https://cdn.sqhk.co/mepofazobi/ygefH5E/great_grandpa_in_spanish_translation.pdfIn PDF document text
    • https://cdn.sqhk.co/xotolodi/ahhFgdi/ice_cream_master_free_food_making_cooking_games.pdfIn PDF document text
    • https://cdn.sqhk.co/buruvalufe/1lgjjdC/highway_101_band_song_list.pdfIn PDF document text
    • http://vifepixakusuped.iblogger.org/ladegopemijedodomewolev.pdfIn PDF document text
    • https://cdn.sqhk.co/zezegawutogu/eVhhjc8/70308945352.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/g1NWb0d/86049174995.pdfIn PDF document text
    • https://cdn.sqhk.co/wejafivelij/BhdsUZg/amusement_parks_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/lofesaxudiwo/ftohi99/38759842873.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/wibedubosateg/19636547670.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/47027534622.pdfIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_f5b4c093f3fe4cac8e1d5e76cef5c7dc.pdf?index=trueIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_82a2b361f4fa48fc96de44698d1667ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/bwv_1064.pdfIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_32f8512ad6d447268a8169cc0ab7e240.pdf?index=trueIn PDF document text
    • http://fafinonez.rf.gd/razagefe.pdfIn PDF document text
    • http://pufaperimixalet.epizy.com/oestrous_cycle_in_rats.pdfIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_fbdfe2c0b77647bc91af21abb3a18974.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
    • 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_off00011910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11910 5996 bytes
SHA-256: 82ced1e30db13128652f2c700ab45506274123d7c6d37f91f0ec61d70a29d6c6
font_01_sfnt_off00012e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E11 5348 bytes
SHA-256: bda344a28d945710871b280ed5e227ee0464ee8962d247b6559d6b0aef91e1fc
font_02_sfnt_off00014066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14066 2484 bytes
SHA-256: 71d489ca799b404f92f1f265c0ad790831edaee34d417a17e5a0bcd97902c65b
font_03_sfnt_off00014b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B05 11812 bytes
SHA-256: eddfc8adeb9cb803f04118dba0d08c10b9a6b64cd971807cd3164ec224908d66
font_04_sfnt_off00017359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17359 16192 bytes
SHA-256: 9c7926b8929b88a1dffb52ec04bcfb477868fd459509337312ce674bafabbb6a