Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe4614e565d464d…

MALICIOUS

PDF

67.8 KB Created: 2021-06-06 06:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2681d26b391821199407f948ecb5e0eb SHA-1: d250dd28a282848c74392a2f4ea512d4c8370dc9 SHA-256: efe4614e565d464d3fa0995768d146ebb15567f32e547af588cf871ac33cc108
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of numerous external URLs suggests a potential for distributing further malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://smidgel.ru/pbw?utm_term=renkli+tecvidli+kur%2527an+pdf+indir PDF link annotation
    • https://nizakibete.weebly.com/uploads/1/3/4/3/134386075/5c4a0.pdfIn PDF document text
    • https://gegoviboz.weebly.com/uploads/1/3/4/8/134876631/9d1fa23f2a23b.pdfIn PDF document text
    • https://nibedubuw.weebly.com/uploads/1/3/7/5/137517062/kotidodumulep-pozireji-konivilosemug.pdfIn PDF document text
    • https://gubaxuxozixiviw.weebly.com/uploads/1/3/1/3/131383744/5a7a089b0c.pdfIn PDF document text
    • https://rukeruxesam.weebly.com/uploads/1/3/4/7/134700508/zewugokolomipu.pdfIn PDF document text
    • https://wixefonimav.weebly.com/uploads/1/3/1/4/131437632/ximobemer.pdfIn PDF document text
    • https://zokukomusisitu.weebly.com/uploads/1/3/5/3/135323242/7478968.pdfIn PDF document text
    • https://vamofelew.weebly.com/uploads/1/3/5/3/135398798/fexoxikejom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378857/normal_5fcc611765f27.pdfIn PDF document text
    • https://gevabebixufusaf.weebly.com/uploads/1/3/4/6/134689319/3256401.pdfIn PDF document text
    • https://farazekij.weebly.com/uploads/1/3/4/3/134379469/norofigiwur.pdfIn PDF document text
    • https://jurutidi.weebly.com/uploads/1/3/5/3/135397820/2084583.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527859/normal_5ff038d2c11bb.pdfIn PDF document text
    • https://nusutaligufobam.weebly.com/uploads/1/3/5/3/135393176/gugukodalaxe.pdfIn PDF document text
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/1673787.pdfIn PDF document text
    • https://zozopagutuduxiz.weebly.com/uploads/1/3/4/6/134669393/dce0505b4d3.pdfIn PDF document text
    • https://sozazajigosana.weebly.com/uploads/1/3/0/7/130739782/kukabeza-tavepexipifop.pdfIn PDF document text
    • https://samarobiratepiw.weebly.com/uploads/1/3/5/3/135327643/3490734.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486213/normal_60272366db191.pdfIn PDF document text
    • https://faliroralomi.weebly.com/uploads/1/3/0/8/130874474/vuper.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naxoxututal.pbworks.com/w/file/fetch/144439410/zumdahl_chemistry_10th_edition_reddit.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/f/zegutovelenekagotixidojod.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_off0000cc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC13 5136 bytes
SHA-256: 6f686984a55c429b4ab9ddb9c340e0d9df11e77b82c991a2a6f76689b778993f
font_01_sfnt_off0000ddb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 11424 bytes
SHA-256: 28925574895507c930c7132d23f8652353109c059b3cec2b19431569a94fa05d