Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e00b6b2396aa82…

MALICIOUS

PDF

76.2 KB Created: 2021-06-07 20:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7cdc60f2ff276c8a1e7884f9a838aa4d SHA-1: ce7fa76dfba058121b326fb402e78ee4562341cb SHA-256: 80e00b6b2396aa821e16d5a42bae3e90722a08cce324855746687bf906a74b4b
234 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or lead to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a 'password-protected archive' lure further supports the hypothesis that this document is a precursor to a payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/pbw?utm_term=how+to+fill+biodata+form+of+sbi+po PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427523/normal_5ff5d03303ab6.pdfIn PDF document text
    • https://kuvakikarubefi.weebly.com/uploads/1/3/1/3/131383404/regenazofikerowirewo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493200/normal_602782381149c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498330/normal_601b8ac909190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473938/normal_60ba8413b4344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380545/normal_606c67498f651.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452381/normal_6011098ea41ec.pdfIn PDF document text
    • https://zizukomeluze.weebly.com/uploads/1/3/4/5/134582384/df984bb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454967/normal_6028241681ee3.pdfIn PDF document text
    • https://nisazixipa.weebly.com/uploads/1/3/0/7/130775104/ce583.pdfIn PDF document text
    • https://fitinunajixir.weebly.com/uploads/1/3/1/6/131637477/famasiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464730/normal_60011f5cb81d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498702/normal_603aa38eb2ec3.pdfIn PDF document text
    • https://favujoki.weebly.com/uploads/1/3/5/3/135302790/nobiko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490369/normal_6020c467aac89.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mapaduzipi.pbworks.com/w/file/fetch/144506583/hitachi_vrf_air_conditioning_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d222aa-8ec8-4e04-9980-ec85ed7fe578/kiwetafiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2079b671-a035-45e6-ad55-8799245b3bef/how_to_connect_rex_c100.pdfIn PDF document text
    • http://labidan.pbworks.com/w/file/fetch/144469281/86647512190.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5611c9f-92a3-457e-83f7-518b2659198d/are_fathers_entitled_to_paternity_leave.pdfIn PDF document text
    • http://zizovitunex.pbworks.com/f/carrom_king_mod_apk_rexdl.pdfIn PDF document text
    • http://xuvabufoj.pbworks.com/f/26837537881.pdfIn PDF document text
    • http://dumunivuniv.pbworks.com/f/luwimigimela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b58d465c-9761-4089-af0f-6410b0d297dc/how_to_calculate_transformer_rating_in_mva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebc76b4e-b524-4f86-ac16-095a0231ce14/94659499703.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_off0000ea5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5A 5380 bytes
SHA-256: 7f23bfde792b43cfaeb329b84bab42781d22d8fc19f15151dca79fa75d160898
font_01_sfnt_off0000fc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9B 10864 bytes
SHA-256: 94d135db5a48eed2f67c1d3aefe464e33ea63b67a3d3b42268e44f2e2b4b9040