Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdac1daf1267c51c…

MALICIOUS

PDF

77.9 KB Created: 2021-03-09 18:47:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e2c40d7de59c15f0d8676785c949a880 SHA-1: 98a2a55f9cdf5f15a78b976fa782302bc5e61fdd SHA-256: bdac1daf1267c51ca1fe10f2d9a4120d802dc832e47ebf7b6c615d7b2aa6f0b4
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://crophysi.ru/award?keyword=arrow+of+god+by+chinua+achebe+summary+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427105/normal_6017ceffb543a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425483/normal_60098b865a05e.pdfIn PDF document text
    • https://vanoxurele.weebly.com/uploads/1/3/1/6/131606202/miwujekejudun.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/ijaYhb8/91448935484.pdfIn PDF document text
    • https://cdn.sqhk.co/tojegaxamox/EiegjIu/28942927671.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzojivemepe/dugiiam/90653112722.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/f1f1dfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454422/normal_601689b62be62.pdfIn PDF document text
    • https://lavafijaxeb.weebly.com/uploads/1/3/0/7/130740432/fejuzegudelonasasur.pdfIn PDF document text
    • https://sudarixadozitot.weebly.com/uploads/1/3/5/3/135331315/9373062.pdfIn PDF document text
    • https://lunisaga.weebly.com/uploads/1/3/5/3/135302545/8d7e14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454546/normal_603b664ec751e.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/4cd052e1-be27-47e7-b3f0-ad2391bc42d8/bogepofuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67004c64-4cf9-4234-a288-d7d990e4297d/44529130147.pdfIn PDF document text
    • http://riwugiboturom.epizy.com/cell_parts_and_functions_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a27010bc-6d80-40a8-92d1-fa2a728b5b43/65080580439.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/angry_birds_transformers_toons_tv.pdfIn PDF document text
    • http://penonas.epizy.com/xarokurofipi.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/lg_leon_4g_lte_case.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/ap_studio_art_concentration_essay_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc59cdb-d357-4570-b31d-585c5f964848/marshall_mg100hdfx_manual_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/581e45c6-ccb3-44a6-ad41-5bca87371c93/how_to_write_an_essay_about_an_important_person.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/46191278589.pdfIn PDF document text
    • http://rofosonovoze.rf.gd/is_a_16_seer_ac_unit_good.pdfIn PDF document text
    • http://vujesidewu.rf.gd/joraxerib.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_off0000f2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 5860 bytes
SHA-256: dcf96143d47b3146499fcfcf4074fd4dc7dd7d7d4396204fe04729b164f51a3c
font_01_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 10268 bytes
SHA-256: 3c6fb79e4bfa056183db2764869f67dd7913cdf01fbd63cba5a8fbb0a5322748