Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ebccc79ea8ca2c…

MALICIOUS

PDF

76.4 KB Created: 2021-04-03 14:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5eff764ad8a9eb3a559f2eb812fdaf1 SHA-1: 95c888d7066951b05c56be4ba550f30f3c06d5ec SHA-256: 92ebccc79ea8ca2cbd882c86c21b27b7b8eb6e52c4fb0005ddb6cfa027617103
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://zajinet.ru/strik?utm_term=igloo+ice+maker+ice+full+sensor
    • https://cdn.sqhk.co/moxelutedoje/htibhhG/93858830768.pdf
    • https://kiloxuloje.weebly.com/uploads/1/3/5/3/135398856/9209248.pdf
    • https://cdn.sqhk.co/menasimax/jcohjhd/92578499541.pdf
    • http://kiwirixup.22web.org/viledamovuzelilogugidupu.pdf
    • https://cdn.sqhk.co/kisesawaropo/gBmOAoQ/redskins_new_name_and_logo.pdf
    • https://cdn-cms.f-static.net/uploads/4493579/normal_5fdc6d9cc1ad4.pdf
    • https://cdn.sqhk.co/kinibemazoz/6F7Yhji/40614143371.pdf
    • https://cdn-cms.f-static.net/uploads/4493227/normal_602e6ca050c18.pdf
    • https://kedabivaj.weebly.com/uploads/1/3/1/4/131438143/7950048.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/35a77f7f-2663-4067-994d-e5f9a84903d4/3_cup_aroma_rice_cooker_instructions.pdf
    • https://uploads.strikinglycdn.com/files/15b5fade-09ef-4355-b131-f3f4dcd1e287/how_to_prepare_a_10_minute_presentation_for_an_interview.pdf
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_b740d389ced44ee58b028ca4bcb2a839.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4578f2b3-15de-4e69-ad08-842b02bf9027/53879587944.pdf
    • https://uploads.strikinglycdn.com/files/9d26fe92-d02d-48cd-be37-6c0ff886d396/antique_clock_repair_salt_lake_city.pdf
    • https://b8f7bc2e-5f90-466c-a76c-b8215bfdb3ae.filesusr.com/ugd/9717d9_e2b11c149dec41ea94805aa3cfac20f4.pdf?index=true
    • http://zodotisejomiga.epizy.com/washington_wizards_nba_scoreboard.pdf
    • http://mariputenokivuw.rf.gd/85233053731.pdf
    • http://timarofata.epizy.com/chemistry_hsc_past_papers.pdf
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_5968f50bafa74d3c81d6ae3142c6710a.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_off0000ed81.bin
fbc2eb5ff5e69d20d7c3fdab79cec05423806f04e144c5567e834babb2ad435c
pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 5200 bytes
font_01_sfnt_off0000ff28.bin
d3a24a5490d6c7101b68e3bddb191e0183870cccd36f4719492fcc2e0a4833b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF28 10780 bytes