Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c91bf200d922a19…

MALICIOUS

PDF

37.8 KB Created: 2020-05-13 18:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ddff06d954846253c847996020519d06 SHA-1: 0ea6b860d07b619b7baf2ab961ac809bde5b62da SHA-256: 2c91bf200d922a19d516cf226d89bc5c8cb2dd8303837efdd4d5ac6f0db35e91
94 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though heavily obfuscated, contains URLs that are part of this link farm. The primary purpose appears to be directing users to a large collection of other PDF files hosted across numerous domains, likely for SEO spam or to distribute further malicious content.

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://kasedetailing.com/uploads/1/3/0/3/130313087/130313087.html#bespeak+forms+of+verbs
    • http://teeoff4vets.com/uploads/1/3/0/7/130776724/3234169.pdf
    • http://hessweb.net/uploads/1/3/0/2/130273573/tisopufanuk.pdf
    • http://sedenobrothers.com/uploads/1/3/0/7/130775407/eea091c1.pdf
    • http://projectterminoslagoon.com/uploads/1/3/1/4/131412955/4d9c30.pdf
    • http://cmsa1992.org/uploads/1/3/0/9/130969899/muzisirolipa_dupufekumuzetut.pdf
    • http://ileanaslavin.com/uploads/1/3/0/6/130604580/3833596.pdf
    • http://fantasyfusionsports.com/uploads/1/3/0/5/130546196/5423732.pdf
    • http://musicandpeople.com/uploads/1/3/0/8/130813730/3441695.pdf
    • http://maedaleather.com/uploads/1/3/1/3/131381103/tulezurene_gamum.pdf
    • http://markjawad.com/uploads/1/3/0/4/130483592/beniraw.pdf
    • http://airwaycore.com/uploads/1/3/0/7/130775071/2305478.pdf
    • http://anniedreams777.com/uploads/1/3/1/4/131406258/tujatigewit.pdf
    • http://drivingmallorca.es/uploads/1/3/1/3/131380305/sinidagimuj-sozofap.pdf
    • http://alexandraforsythermt.com/uploads/1/3/1/4/131438248/ec901.pdf
    • http://tommybatchelor.net/uploads/1/3/1/3/131384709/2dd6ced8.pdf
    • http://fachapotheke-seltene-krankheiten.at/uploads/1/3/0/6/130639869/3f68226b58.pdf
    • http://moco-bay.com/uploads/1/3/0/2/130272282/furupezareru_mapejevawureri_rejulug.pdf
    • http://y-iptv.net/uploads/1/3/1/1/131163666/8960356.pdf
    • http://georgiabellydance.com/uploads/1/3/0/5/130588672/5265453.pdf
    • http://chelseaart.studio/uploads/1/3/0/3/130323767/42296a3.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f7c.bin
2cba2f9f4f393170193347eda37d9310850d179a834b238a53bc3407fb6d5b17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7C 3044 bytes
font_01_sfnt_off00006a49.bin
313b8029e9202fa56836ded057890b5430ae9384f4fa17822871e5c344dff73f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A49 9536 bytes

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