Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee5917c858e1811…

MALICIOUS

PDF

85.3 KB Created: 2021-03-28 16:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ff11e75055ba2bda97aa0dd655a1abe2 SHA-1: b827de381a48a3b91e38a36a53e3e5ddd7395924 SHA-256: 8ee5917c858e1811efb19e698796cb92b6f970091cd2d39dcc539fc746be65b8
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 0.9990

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://druttle.ru/award?keyword=birthing+plan+template+pdf PDF link annotation
    • https://cdn.sqhk.co/nebafori/jjsid1E/kitchen_drawer_runner_parts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496824/normal_5fdbe55f6537a.pdfIn PDF document text
    • http://bu-markett.com/official_summer_sport_of_canada_codycross57psy.pdfIn PDF document text
    • http://thechambre.xyz/tedonohupyl.pdfIn PDF document text
    • https://cdn.sqhk.co/zolilobup/3ibjhgh/shooting_battle_mod_apk_1._16._0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418000/normal_60390a3272364.pdfIn PDF document text
    • http://idealicaitaly.site/845886972288tzhv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459641/normal_605bccd6b1177.pdfIn PDF document text
    • https://cdn.sqhk.co/pifajaloro/jcZ4E5k/ghostrunner_ps4_release_date.pdfIn PDF document text
    • http://look-hotel.com/gold_farm_wow_classic_hunterek3iz.pdfIn PDF document text
    • https://cdn.sqhk.co/sejixikerut/Ulgchcq/mulamuxizibadut.pdfIn PDF document text
    • https://cdn.sqhk.co/kujufemom/hIjb9f0/24709092834.pdfIn PDF document text
    • https://rizapomon.weebly.com/uploads/1/3/0/7/130739727/dijovizovowuvel-sorag-semikovopisewiv.pdfIn PDF document text
    • http://francobusiness.com/david_deangelo_double_your_dating_free_downloadktief.pdfIn PDF document text
    • https://sekorora.weebly.com/uploads/1/3/4/8/134856449/dudadivagewam.pdfIn PDF document text
    • https://bewepuxajijasi.weebly.com/uploads/1/3/4/3/134362307/pirubewan.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/HhiTf3Q/botala_bhangibi_gori_to_duare_dj_appu.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/Ws0oOhc/zakazupexonered.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunaropiz/ahagdJd/14276602682.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487200/normal_60543f593c314.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://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_27a0bb6d6e764120a57e7868cae34edb.pdf?index=trueIn PDF document text
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_6b1af4022ccb4987854d38e8b11ffa69.pdf?index=trueIn PDF document text
    • https://2571d5ef-7130-409a-b87d-c3fd18a83f30.filesusr.com/ugd/71fc55_f5981d2bea6046e0ae92d6b0833b4607.pdf?index=trueIn PDF document text
    • https://dd3a609d-fcd9-461e-ae06-f7e9ec6f332d.filesusr.com/ugd/811c3f_cbc69b3afb214e9a9f5a9c0fead26bbd.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10116 5004 bytes
SHA-256: 0de9195f8c1ba69ae79c66303479499c24be2b9b436e239e35c88af39c589fa1
font_01_sfnt_off000111e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E4 11212 bytes
SHA-256: 12c54e337f4bf5435510591dab3106aee668660a5186a0d675fa35f77ae0ebc0
font_02_sfnt_off00013815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13815 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2