Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a891a67e19c18da…

MALICIOUS

PDF

32.7 KB Created: 2020-05-17 19:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 7b5a85518f57e5e62d5f4f2150b06afb SHA-1: bf0af296a3a10ec94eeaba88a3a0f00a7b190d70 SHA-256: 7a891a67e19c18daa7271945ca0b3d2bf7116f186596e123f923de151c8ae863
104 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files with numeric slugs. This pattern is indicative of a link farm or SEO spam campaign, potentially used to host malicious content or distribute further malware. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://nolimitationsyouthservices.org/uploads/1/3/0/6/130605111/130605111.html#netbeans++for+macbook+pro PDF link annotation
    • http://ukswsc.com/uploads/1/3/1/3/131398000/vutexowijasamuk-lajademalos-melejeze.pdfIn PDF document text
    • http://flaherman.com/uploads/1/3/0/5/130544413/lamuzofemarof_zebufuxupep_moxepipivoka.pdfIn PDF document text
    • http://chronityinvestments.com/uploads/1/3/0/4/130477310/kivolonosowi.pdfIn PDF document text
    • http://7soundenergy.com/uploads/1/3/0/3/130379458/gibufofepad_sakabof_todanafimasetu_gipodidarififeg.pdfIn PDF document text
    • http://bandbpoolservice.net/uploads/1/3/0/6/130621516/wesibemixaxiw.pdfIn PDF document text
    • http://totalinjection.net/uploads/1/3/1/4/131438098/mibutoweroxe.pdfIn PDF document text
    • http://kissnivy.com/uploads/1/3/0/6/130604639/4a6635848f.pdfIn PDF document text
    • http://timsellersod.net/uploads/1/3/0/2/130289262/jagasonajonebuwipu.pdfIn PDF document text
    • http://trailbalzingamstaffs.net/uploads/1/3/0/7/130739648/6cc922.pdfIn PDF document text
    • http://bankshomecare.com/uploads/1/3/0/6/130604945/faxuweru.pdfIn PDF document text
    • http://infinitychocolates.com/uploads/1/3/0/6/130604653/bodis.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
🗂 Part of campaign: 158west.com 6 samples

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54FD 10176 bytes
SHA-256: 86eda61ca896795b8fd74f675c8b519f4910e4fc986a651e5b6228f1e7c903d5

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