Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30fc414da1f92d2…

MALICIOUS

PDF

64.7 KB Created: 2020-12-22 20:15:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 493a1cb2ddc1464d23edcff0525c4ade SHA-1: 9bda818639048235062aaac5566e2ef90111b8bc SHA-256: b30fc414da1f92d26cbf8ff699dc5617329e65676081e7d1fea01231383b431c
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 0.9998

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://trafffe.ru/strik?utm_term=printable+bingo+calling+cards+1-+75 PDF link annotation
    • https://dekedenavit.weebly.com/uploads/1/3/4/6/134612093/8456057.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386836/normal_5fb80a50ebb08.pdfIn PDF document text
    • https://vafumavuforowa.weebly.com/uploads/1/3/4/4/134489815/4914092.pdfIn PDF document text
    • https://sifajovu.weebly.com/uploads/1/3/4/8/134874608/4638991.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369509/normal_5fad39bca90ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f86f73765d37.pdfIn PDF document text
    • https://zosupexaduj.weebly.com/uploads/1/3/0/7/130738593/fagaxufizaler_nobesa_zixujejelujix_rumadaniwam.pdfIn PDF document text
    • https://gekomawaloloro.weebly.com/uploads/1/3/4/4/134443710/6694d17619b.pdfIn PDF document text
    • https://komulobuzol.weebly.com/uploads/1/3/4/6/134618259/a962b82deee842.pdfIn PDF document text
    • https://zujakeme.weebly.com/uploads/1/3/4/0/134041616/wiwadu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/bedofigafujiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7be2bcdf-60fc-48e6-8d24-493cb9b59141/wizexuzutedogi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdec0a62dcd53187f2068e5/t/5fdf0ce55809ae3434093cba/1608453350062/sphax_purebdcraft_1._14.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/atal_pension_yojana_exit_form.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_off0000c0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C5 5536 bytes
SHA-256: 7549c6c5e2e3f1aab20e5e56f6b17994cb5800afde5f794b2d786102f733c8c5
font_01_sfnt_off0000d3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B6 10104 bytes
SHA-256: 0e8c051678925993a6230432cada138631b1e865aff3da46b415c811686401fc