Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d0fd42a000e324…

MALICIOUS

PDF

84.4 KB Created: 2021-03-23 03:52:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 91b0a83ec7cf37f58158b24120b9dbb3 SHA-1: 73a11536c04cd4e673b580961d1ba486e16a5ab1 SHA-256: 50d0fd42a000e3242b6d09637eecbbafff4e2deae7b8050706514e64dcda4ab3
184 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to malicious infrastructure, specifically targeting search queries like 'how to reset mitsubishi tv lamp'. Heuristics indicate the PDF is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=how+to+reset+mitsubishi+tv+lamp In PDF document text
    • https://bipovubukixepev.weebly.com/uploads/1/3/2/7/132740720/6250554.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/nhchxhi/kirinipizosedodumaperado.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/GZojbhe/ea_sports_ufc.pdfIn PDF document text
    • https://zebazowis.weebly.com/uploads/1/3/4/3/134310266/woxemubafizas.pdfIn PDF document text
    • http://fewafef.iblogger.org/elena_undone_imdb_parents_guide.pdfIn PDF document text
    • https://duxetaxegijojem.weebly.com/uploads/1/3/4/8/134870405/9453160.pdfIn PDF document text
    • https://siresikewutawin.weebly.com/uploads/1/3/0/7/130739490/4049192.pdfIn PDF document text
    • http://gixifumesu.22web.org/73883671655.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_600d547999aeb.pdfIn PDF document text
    • https://kowenijog.weebly.com/uploads/1/3/4/0/134096242/vunopijidim_gemurasavubozip_razodarukesog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460963/normal_6033fb2193957.pdfIn PDF document text
    • https://cdn.sqhk.co/pejinijew/hhiid5v/latest_dj_sound_effects_2019.pdfIn PDF document text
    • http://dutivozupofamap.22web.org/68472087318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410976/normal_602b46c01896b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_5ffe5a1cd77145d0b7b94850c4943715.pdf?index=trueIn PDF document text
    • http://degivenumi.epizy.com/purpose_of_arcing_horn_in_transformer.pdfIn PDF document text
    • http://mebapuperepomuv.rf.gd/foolproof_answers_module_18.pdfIn PDF document text
    • http://bonizeza.epizy.com/4818610060.pdfIn PDF document text
    • http://lawigut.rf.gd/comparatif_et_superlatif_exercices_corrigs.pdfIn PDF document text
    • http://fewuzefar.rf.gd/gowamimomuruwazisit.pdfIn PDF document text
    • http://kawijawo.rf.gd/wifineguvegatixoma.pdfIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_43df284d9cc740b79edf07c2ac6aea1f.pdf?index=trueIn PDF document text
    • http://jifadeve.rf.gd/8_ball_pool_rules_south_africa.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 5312 bytes
SHA-256: 7ed9c99f0a0c8a73ec447843032ff7ac3de3a55e8748ae66a3031771ae90d7cb
font_01_sfnt_off0001079f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079F 10732 bytes
SHA-256: 027fb63a388d6bc88500dbbefed31430d7dad449bc83b7d28c113c9c6246461a
font_02_sfnt_off00012cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB0 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf