Malicious PDF — malware analysis report

Static analysis result for SHA-256 a459a13c2bc88a2d…

MALICIOUS

PDF

120.8 KB Created: 2021-05-15 19:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5c4b71ff0097c1846d44852027c3a162 SHA-1: 9d8aa3303b415f8c909fbb19d060f4015046311f SHA-256: a459a13c2bc88a2d21c1522f2c943d81e96db14dfa3b019a9a917aa4e91a300e
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 0.9989

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://jumiwimov.ru/strik?utm_term=who+killed+avatar+kyoshi PDF link annotation
    • https://cdn.sqhk.co/levowexesu/geVCshf/play_new_slot_games_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/hdfifcl/xavokemanemug.pdfIn PDF document text
    • http://paxejunon.mygamesonline.org/caprice_24_john_williams.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/gPifhhc/actor_tycoon_2_download.pdfIn PDF document text
    • http://ujjjrrrrr.space/7_natural_wonders_of_the_worldfn9e7.pdfIn PDF document text
    • http://kisizifavo.getenjoyment.net/somujovufixuzevilodobovom.pdfIn PDF document text
    • https://kororopimebopam.weebly.com/uploads/1/3/4/6/134645688/kolugesadag.pdfIn PDF document text
    • http://hookup682.site/amazfit_bip_manuale_italiano3b8ds.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/KdpdhiP/vegapaxige.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutazomaga/geOjagh/winking_lizard_avon_clambake.pdfIn PDF document text
    • https://sexitikimuzulab.weebly.com/uploads/1/3/5/2/135296232/4ed7cf68.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/faktor_resiko_atonia_uteri.pdfIn PDF document text
    • http://sollabs.xyz/xbox_live_problems_today_uktzwkz.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/adHhhic/gupivamerogememirebawok.pdfIn PDF document text
    • https://cdn.sqhk.co/pijujuweg/ehfgehd/english_video_song_2020_download.pdfIn PDF document text
    • http://good-production11.site/724_area_code_in_michiganyr8yr.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/ejd3jgi/houseparty_games_app.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
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_cbcb9d3a40594a2ea7b187e5d4544415.pdf?index=trueIn PDF document text
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_b150178e20ca4b60be32d6dc7fd1e6bf.pdf?index=trueIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_88cf19cd6ec64f0ebe68f7b6570f4c55.pdf?index=trueIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_3fa64c09033d45cfb1f23b9af9e9bc84.pdf?index=trueIn PDF document text
    • https://41d9b059-0b17-466b-96e6-f31a3f3e9b19.filesusr.com/ugd/f1ead9_2d262aec2b744596b0974149a743be93.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16594 12004 bytes
SHA-256: e4c2ec1f9fbe2d26e54f067597313e7113553bd8d988804838e793bd3576c1e9
font_01_sfnt_off000185e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185E4 3476 bytes
SHA-256: 6da4d2a5d4ee5f79d0319ba392510675781a0d5d5500604ebf0b495958d7c115
font_02_sfnt_off00019226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19226 4836 bytes
SHA-256: 0e4ce39fb3e017f62b5214176077c77ca28a8e8cd4705568ff39988f39e6ee22
font_03_sfnt_off0001a2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2B4 10588 bytes
SHA-256: d997405d08c33e9e225c8c0b18819a73d72466b39267b519aa4359047fe48f61
font_04_sfnt_off0001c6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6CF 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2