Malicious PDF — malware analysis report

Static analysis result for SHA-256 61cb9705737ebe35…

MALICIOUS

PDF

72.0 KB Created: 2021-03-14 10:26:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 613133dbdc01b66aea19725ebfc35de0 SHA-1: 3fb1984bab733151f9ceffd92323be509ab879ed SHA-256: 61cb9705737ebe35681bd53bdb2b7c244ea1ffc363c224867d7caf527ca74eb0
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 0.9993

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://botokaw.ru/award?keyword=ethiopian+grade+5+english+textbook+pdf PDF link annotation
    • https://cdn.sqhk.co/pasezateda/4geiiih/xurotumit.pdfIn PDF document text
    • https://cdn.sqhk.co/boxoveru/wp9hfzY/guess_the_running_man_netflix.pdfIn PDF document text
    • https://cdn.sqhk.co/visesefider/jciggf1/wiguz.pdfIn PDF document text
    • https://bujajegufo.weebly.com/uploads/1/3/4/1/134108800/vamidabagejufefafi.pdfIn PDF document text
    • https://cdn.sqhk.co/dipasupor/Jhi0gjn/stormblades_gameplay_pc.pdfIn PDF document text
    • https://dixodenifafazud.weebly.com/uploads/1/3/1/8/131856669/digaz_mogoxujawit_gazaliwufalitev.pdfIn PDF document text
    • https://vajinivokesele.weebly.com/uploads/1/3/5/3/135326698/ec4dffd0cf.pdfIn PDF document text
    • https://cdn.sqhk.co/lexikegije/idijEsX/tour_texas_state_university.pdfIn PDF document text
    • https://diriremipujuna.weebly.com/uploads/1/3/4/2/134265666/68197.pdfIn PDF document text
    • http://zagodutaf.getenjoyment.net/megazubukodudik.pdfIn PDF document text
    • https://mogudigadoto.weebly.com/uploads/1/3/2/6/132695399/bibig_mijeb.pdfIn PDF document text
    • https://sudikefasegez.weebly.com/uploads/1/3/1/0/131070357/5ae64d1613ce5.pdfIn PDF document text
    • https://vixezikuf.weebly.com/uploads/1/3/1/3/131383943/4302151.pdfIn PDF document text
    • https://badetujunomut.weebly.com/uploads/1/3/1/8/131857650/ninuma-zazenof.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/Gihfy5F/pick_a_brick_cup_lego.pdfIn PDF document text
    • https://pigumetazemebet.weebly.com/uploads/1/3/0/7/130775485/jofozefele-wumegutenas-zexedadozaz-pafolulipinux.pdfIn PDF document text
    • https://vomuxetajamusu.weebly.com/uploads/1/3/1/8/131857717/6342994.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanunir/hjfJWVc/11629598723.pdfIn PDF document text
    • http://kunujunekedi.mygamesonline.org/97720410121.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/2d00e97b-dda4-4e6d-a5d3-58978cb17cc7/dell_8300_xps_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e05602fb-69a7-441b-a3ad-0cdbab9d7fdd/shark_navigator_lift_away_deluxe_brush_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54e7d35c-6e10-47f7-9336-ea5640dd76b8/what_is_verbal_communication_explain_its_types.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7da353fc-f432-4bc0-947a-3470277b1f6b/46960250339.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_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 5656 bytes
SHA-256: aed8b31a9c77732741513a128a53de497a616a419fbc5e2b3f037fa009ba0d2d
font_01_sfnt_off0000ede4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 10208 bytes
SHA-256: e129dbf6a20322dfb4f7c35aac12b4e8d83b4c576f74e6be23b5c644bc33acd1