Malicious PDF — malware analysis report

Static analysis result for SHA-256 630d0d4755c7bd01…

MALICIOUS

PDF

77.4 KB Created: 2021-01-15 04:21:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 650ec1e0eb7a00904cd92f4a215553a4 SHA-1: eca4b9a788ae21ed5322a4c9c5057db404b5b44c SHA-256: 630d0d4755c7bd01d934938ab4da6464553c2b6ae996b01e077f9302623f6d97
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links pointing to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the link farm heuristic point towards an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://traffnew.ru/123?utm_term=taxonomy+classification+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388272/normal_5febaa30f36b8.pdfIn PDF document text
    • https://jitivafume.weebly.com/uploads/1/3/0/9/130969372/farefipuvu.pdfIn PDF document text
    • https://musisemikalig.weebly.com/uploads/1/3/4/6/134694348/gefumagubitoga.pdfIn PDF document text
    • https://zusiwugebibod.weebly.com/uploads/1/3/4/4/134484471/winad-nepovufivog-pafadunezej-bewuduri.pdfIn PDF document text
    • https://site-1204816.mozfiles.com/files/1204816/93216112362.pdfIn PDF document text
    • https://site-1167954.mozfiles.com/files/1167954/bujodolusozabu.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/jihhjtb/la_novella_degli_scacchi.pdfIn PDF document text
    • https://site-1166749.mozfiles.com/files/1166749/halloween_costume_store_around_me.pdfIn PDF document text
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/gajunodomupuxe.pdfIn PDF document text
    • https://dikosunasalimob.weebly.com/uploads/1/3/4/3/134363034/kisidajulawegif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479240/normal_5fbbf4c8a3412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368492/normal_5fd28239bd6ec.pdfIn PDF document text
    • https://site-1167971.mozfiles.com/files/1167971/14492472094.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 5396 bytes
SHA-256: 2cd83eb8c8a9609bcf9b8e23340197281405332684a83693a2d820c27db31224
font_01_sfnt_off000103d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 10796 bytes
SHA-256: 980cf6b4f978990f69dcaa976d343c40ec1a76ceb6efa1278fea956ec294d22d

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