Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e0bb26d0ed610f…

MALICIOUS

PDF

92.8 KB Created: 2021-03-19 13:46:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2d9056d0be39a7a5d5a06cd119a8d8ac SHA-1: db2565e40943a4ce2087a9929b9922f1285fff5b SHA-256: 81e0bb26d0ed610fada11b58b773844c0c0886f320a83170ec01636146dfe592
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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 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://dugedepap.ru/strik?utm_term=how+to+bypass+frigidaire+washer+lid+switch PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408997/normal_600202286eb3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414866/normal_6037a6ed8ef58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412768/normal_5fe8889737482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483088/normal_601a2afe1da10.pdfIn PDF document text
    • http://fullhp.info/strongs_concordance_2137hlz13.pdfIn PDF document text
    • http://igafnd.org/sims_4_cheats_code4zjmm.pdfIn PDF document text
    • http://rimka.xyz/97502976129a3h8j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370051/normal_602623782b254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369660/normal_603e64ae55e1b.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/earthquake_news_report_snl_scriptxmjur.pdfIn PDF document text
    • http://micrometerdigital.xyz/filmywap_2018_hollywood_bollywood_movies9kmx1.pdfIn PDF document text
    • http://pumutug.iblogger.org/jewolikemerefemupupinuw.pdfIn PDF document text
    • http://tijipavafetudo.22web.org/cuisinart_coffee_on_demand_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485800/normal_5fe0a1d7971ae.pdfIn PDF document text
    • http://fazoluniguket.iblogger.org/scp_containment_breach_save_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413850/normal_5fdd21c4702dc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zoxejotemop.rf.gd/allen_bradley_product_catalog.pdfIn PDF document text
    • http://rawotagetanona.rf.gd/brother_intellifax_1270e_service_manual.pdfIn PDF document text
    • http://puxalalofevan.rf.gd/samsung_bd-j7500_manual.pdfIn PDF document text
    • http://damadikaj.epizy.com/nueva_cascada_de_coagulacion_2020.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12783 5712 bytes
SHA-256: 128d9d6247c011d5916a1af965eead500aa2ec17e53d9f0d8b0acb7b18ae9dd0
font_01_sfnt_off00013af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF8 12076 bytes
SHA-256: 25ac1c00a19aacefae5def6c2ec437f2c602df4694d6e2d383edb31407102125