Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c4fbc1f1c4c7ea…

MALICIOUS

PDF

82.8 KB Created: 2021-03-06 00:32:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f56c0ffa87ac6ee0f7c06263485f0925 SHA-1: d3b5ea24f6f30dfc05ec6e8c21930f6e731af421 SHA-256: 82c4fbc1f1c4c7eaa2ceec7b72dc1a3379ca56cf2bf8e9656ae48140b2ed39bb
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The presence of 'utm_term' in one URL suggests a phishing or SEO manipulation tactic. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and embedded URLs designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://baarspo.ru/strik?utm_term=the+crown+season+3+episode+4+accurate PDF link annotation
    • http://instapodarok.site/52556888109ojxet.pdfIn PDF document text
    • https://xikobidena.weebly.com/uploads/1/3/6/0/136097244/a53fa06.pdfIn PDF document text
    • http://chambrehub.xyz/950027400684s6u5.pdfIn PDF document text
    • https://supuzuvafexag.weebly.com/uploads/1/3/5/3/135383103/411166.pdfIn PDF document text
    • http://fsfsfd.xyz/wamifusulupevetas2nsy4.pdfIn PDF document text
    • http://kurixuj.sportsontheweb.net/ntuser.dat_windows_7.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/machine_learning_algorithms_for_healthcare_data_analytics.pdfIn PDF document text
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/bewuzitevozumagixot.pdfIn PDF document text
    • http://naturalgood.space/719186430e6am3.pdfIn PDF document text
    • http://mitsumoro.ru/ink_cartridges_for_canon_mx700_printerse39n.pdfIn PDF document text
    • http://mizebojusur.mypressonline.com/34825907356.pdfIn PDF document text
    • http://finansi-7.online/zajiloriwatovafiririh55r5.pdfIn PDF document text
    • https://nonesuwenuvav.weebly.com/uploads/1/3/4/4/134400251/banab-kunatuzuz-tinutaso-xumimedoxu.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/tizuwa.pdfIn PDF document text
    • http://ita-bio.fun/25947654188qbda2.pdfIn PDF document text
    • http://musc-media.xyz/online_car_games_free_for_pc3vjp6.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://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_6a8fd79eb9ef4173878ad7e4756f5c4a.pdf?index=trueIn PDF document text
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_e9262b4022f24ed6bb4394936861b48e.pdf?index=trueIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_befb7a71d7d449eda032b7e681d467ad.pdf?index=trueIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_0ea951f98d124d79af94f9aa0923ba67.pdf?index=trueIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_420dd8bb03c14e68ba96b45c75cb51f1.pdf?index=trueIn PDF document text
    • http://lazuletezofik.onlinewebshop.net/garmin_nvi_1490_update.pdfIn 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_off0000f78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 5304 bytes
SHA-256: baebf22879935cd71c86ed82ed54f949f19b40c30050a1169be35a7c5d1ce15b
font_01_sfnt_off0001099b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099B 11080 bytes
SHA-256: f6e5c73b58a638f1594d04fabd2379bfcca35b2b338c7df39252a0514220bc29
font_02_sfnt_off00012f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F32 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176