Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e7538530883792…

MALICIOUS

PDF

45.5 KB Created: 2020-03-30 01:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-07
MD5: 4b9d6d22b4ecda02cdd6d97a0288227e SHA-1: e43850637ee1fb9acf1d00ae76332689bda51a3b SHA-256: d5e753853088379293a8b3d9b95aa407adc0d2a71444b50c3cca86045cfb1f39
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to PDF files with numeric or generic slugs, indicative of a link farm or SEO spam operation. The document body itself is minimal, containing only a title related to a mathematical equation and metadata from the PDF creation tool. The primary heuristic identified a mass of external PDF links, suggesting the document's purpose is to drive traffic to these external sites, potentially for malicious redirection or further content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://74-123-75-235.mgwnet.com/uploads/1/3/0/7/130739393/130739393.html#equation+for+total+surface+area+of+a+triangular+prism PDF link annotation
    • http://nourishhealthservices.com/uploads/1/3/0/4/130435524/musewurudibov_bapalisup.pdfIn PDF document text
    • http://hostmaster.esserebellaboutique.com/uploads/1/3/0/6/130621814/1253985.pdfIn PDF document text
    • http://holdmetighttucson.com/uploads/1/3/0/6/130639552/ef82049d47d052.pdfIn PDF document text
    • http://divinestyle.shop/uploads/1/3/1/4/131437119/4424054.pdfIn PDF document text
    • http://commishkit.printemall.com/uploads/1/3/1/3/131384544/2231865.pdfIn PDF document text
    • http://danyafrench.com/uploads/1/3/0/6/130603979/f58bd389fa.pdfIn PDF document text
    • http://carefree-efficiency.com/uploads/1/3/0/3/130324331/4263943.pdfIn PDF document text
    • http://iwa-building-the-future.com/uploads/1/3/0/6/130604787/9673150.pdfIn PDF document text
    • http://yoni-licious.com/uploads/1/3/0/5/130588590/rojeravove-pomuzi-lefojalowi-xelijinifovod.pdfIn PDF document text
    • http://34management.com/uploads/1/3/0/2/130289508/827ba.pdfIn PDF document text
    • http://idelaforce.com/uploads/1/3/0/6/130639976/wegatokab.pdfIn PDF document text
    • http://cairnsclassictours.com/uploads/1/3/1/3/131381428/165311.pdfIn PDF document text
    • http://killaboxing.com/uploads/1/3/0/4/130435649/968123.pdfIn PDF document text
    • http://ediscoveryiq.com/uploads/1/3/0/8/130874133/nizitanosex.pdfIn PDF document text
    • http://tranzsistamedia.net/uploads/1/3/0/7/130739043/vuxege_nejuwasenameb_raterijabitu.pdfIn PDF document text
    • http://transitions.today/uploads/1/3/0/7/130775387/vizove-wepaxumile-bosagoxakikofo.pdfIn PDF document text
    • http://adoravida.com/uploads/1/3/0/5/130539295/kubufanijes-lakatibu.pdfIn PDF document text
    • http://leadershipschools.services/uploads/1/3/0/5/130550855/fojukemaxiba.pdfIn PDF document text
    • http://roblesplasticsurgery.net/uploads/1/3/0/8/130874139/fejater.pdfIn PDF document text
    • http://cfstephenville.com/uploads/1/3/0/7/130775129/4731452.pdfIn PDF document text
    • http://avenuesacademics.com/uploads/1/3/0/4/130488365/monazifop_pezomimisomufaz.pdfIn PDF document text
    • http://lemonthardware.net/uploads/1/3/0/6/130620869/7095845.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74B8 7780 bytes
SHA-256: b1f6d40baffd248300d809a9dbcccdca37810ddbc172fbd95ca6dd4a678275ab
font_01_sfnt_off0000932e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x932E 16036 bytes
SHA-256: b3affdfdfee497c2d3230853582529cf395d265bfdbb8cde7d84ae9c33602211

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