Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7fb8a9e7e0829c9…

MALICIOUS

PDF

85.7 KB Created: 2021-06-14 12:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 81ac81f64745fdb8bc7e4d2c93def574 SHA-1: bb30d0fe5e691a6f09f078533a07728f60a4d2cb SHA-256: c7fb8a9e7e0829c9a063e145a9723fa94bdc16096fad37d9208f154f910388db
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 0.9991

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://pixomot.ru/pbw?utm_term=whatsapp+hacker+8.13+apk+descargar PDF link annotation
    • https://suxaposalepet.weebly.com/uploads/1/3/4/6/134677753/9606733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_603ec0fe6ac34.pdfIn PDF document text
    • https://medekegiloninev.weebly.com/uploads/1/3/4/7/134716174/5569473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383698/normal_5fd9f37d3659b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369926/normal_5ff75d7304e58.pdfIn PDF document text
    • https://tusutaxuwipafu.weebly.com/uploads/1/3/4/4/134403355/koxolulezanikaguxuve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456989/normal_5fe850ec25a2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386839/normal_603e3332edaaf.pdfIn PDF document text
    • https://kubegagalinono.weebly.com/uploads/1/3/4/7/134714436/texuzumebelo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491927/normal_60be7174db887.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ffeb02c-8bce-47df-bd52-9fabf7d56c78/34552567521.pdfIn PDF document text
    • http://viruniruxo.pbworks.com/f/year_8_fractions_worksheets.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/f/introduction_to_architecture_francis_ching_free.pdfIn PDF document text
    • http://ladopupog.pbworks.com/w/file/fetch/145242153/bengali_cinema_i_love_you.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9938ecb5-56a4-455e-b056-6bd57487276a/how_to_learn_drawing_and_painting_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/180b3a4e-aa3c-41e5-8f24-135aafcc0c41/how_to_fix_xfinity_remote_volume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c40d62d4-0210-47d3-b358-7ec5eb362121/do_keto_detox_pills_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/492af7de-fc83-4e09-9a8a-92024a681b26/homelite_2700_psi_pressure_washer_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4443cc22-a1fa-452e-8b44-b473158f951f/defokupegifesimobito.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/w/file/fetch/144559716/animal_classification_key_worksheet_ks2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64b6336a-25d7-4f40-bb1d-bdf2ee4606f6/wegoxaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d072d11-53a1-4cf1-beb1-4aa6af016ae5/how_to_fix_lazy_spa_error_code_e04.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62C 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off0000f711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF711 5820 bytes
SHA-256: f4216cc14a7f5766a6d39e6a8c6101bb6d41d16ab1d56914a110c5cfcc1cf05a
font_02_sfnt_off00010af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF6 11956 bytes
SHA-256: c95b1d5397c4db4d02005a551467d4d62ff301c1259871e54940b14c8beca262
font_03_sfnt_off00013200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13200 16144 bytes
SHA-256: 764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf