Malicious PDF — malware analysis report

Static analysis result for SHA-256 de893af75c01ebd5…

MALICIOUS

PDF

186.0 KB Created: 2021-04-08 07:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: add204fc8756e40a4776ccda8b7ee1ba SHA-1: 34335f8323375102bcf07061a9a5f86d9d43dc52 SHA-256: de893af75c01ebd5c51fcde15848d4a23123ae6b81ad2a7fe29a9be8eeee42fc
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an external URI pointing to 'jumiwimov.ru/strik' with a 'price+of+matic' query parameter, suggesting a lure for cryptocurrency-related scams or phishing. The PDF also functions as a link farm, with numerous embedded URLs, many hosted on disposable domains, further supporting a malicious distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9628

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=price+of+matic
    • https://static.s123-cdn-static.com/uploads/4367297/normal_5fe1c3ac2674c.pdf
    • https://cdn-cms.f-static.net/uploads/4480598/normal_60512355a5484.pdf
    • http://takipibimaxubov.sportsontheweb.net/the_endocrine_system_consists_of_neurons.pdf
    • http://nutapobo.iblogger.org/general_properties_of_nanomaterials.pdf
    • http://xexugij.iblogger.org/lowovibebotejuwuto.pdf
    • https://roturusuwanowus.weebly.com/uploads/1/3/4/3/134363773/fakomedolagirit-xanamavepoda-rovixoxar.pdf
    • https://cdn-cms.f-static.net/uploads/4482207/normal_60502efd08489.pdf
    • http://gogejevi.iblogger.org/angel_of_death_game_guide.pdf
    • http://digovin.getenjoyment.net/zojiwudawavibumodeja.pdf
    • https://static.s123-cdn-static.com/uploads/4420019/normal_600225fc6702b.pdf
    • https://cdn-cms.f-static.net/uploads/4465018/normal_60165b6ae3580.pdf
    • http://faripofijukevom.mywebcommunity.org/51851102415.pdf
    • https://pavuxutekukos.weebly.com/uploads/1/3/4/7/134704216/3225313.pdf
    • http://sigipor.iblogger.org/makaduwunu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fedorahosted.org/lohit
    • http://pekowob.onlinewebshop.net/away_in_a_manger_free_piano_sheet_music.pdf
    • http://zurabogefu.rf.gd/ontological_status_of_information.pdf
    • https://s3.amazonaws.com/nabifovu/nazerusewor.pdf
    • http://lelesajik.epizy.com/fovadinonirusosuxovofi.pdf
    • https://s3.amazonaws.com/zemunomipazikez/greasecutter_plus_data_sheet.pdf
    • http://wodebupikeziv.epizy.com/principles_of_language_learning_and_teaching_6th_edition.pdf
    • 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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00023082.bin
b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
pdf-font-stream PDF embedded font (sfnt) at offset 0x23082 6744 bytes
font_01_sfnt_off00024167.bin
032ececcb817567bfa1a18d90b64cb47f3e33f3166fa39226b321ee48fe79399
pdf-font-stream PDF embedded font (sfnt) at offset 0x24167 4500 bytes
font_02_sfnt_off00025094.bin
d83ff177e14258621ee2309cecd3a59192057cdbc2b7e853d75842b826d8d0d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x25094 11400 bytes
font_03_sfnt_off000274ad.bin
5ba262bc63962e640b8331d2c6a33451a75ee99971c5b9bdbf8b2d6f6f8d27a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x274AD 11832 bytes
font_04_sfnt_off00029d72.bin
86167bdcdfc22ea9b49737dd3e04c45758fe56a0bb000b18940d1c745d882d78
pdf-font-stream PDF embedded font (sfnt) at offset 0x29D72 17260 bytes
font_05_sfnt_off0002b6db.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x2B6DB 4324 bytes
font_06_sfnt_off0002c4db.bin
641a4d64ac60de00dd98e7c2b6d06916a87124a560b8c764d6f0d3c2ab99144e
pdf-font-stream PDF embedded font (sfnt) at offset 0x2C4DB 5460 bytes