Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e261ffd781dc4d…

MALICIOUS

PDF

108.5 KB Created: 2020-04-03 01:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-08-10
MD5: 8d0864f5ef57df281b9693fd1c246768 SHA-1: 46e25c4acbf55cba7d872be3fb60b35bdcbbea78 SHA-256: 37e261ffd781dc4d999047611420a57917e9dd9fc3c68dcfdc93c36376dbc28e
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO spam or to direct users to malicious websites. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, indicating a likely attempt to manipulate search engine results or distribute malware through these links. No scripts were extracted, and the document body is heavily obfuscated, making it difficult to determine a more specific attack pattern beyond link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://bwmontagen.com/uploads/1/3/0/4/130488700/130488700.html#covet+island+of+desire+youtube PDF link annotation
    • http://eshibofengyunzuqiu.br3h.com/uploads/1/3/0/4/130435590/xileviremizumilof.pdfIn PDF document text
    • http://apapparellondonltd.net/uploads/1/3/0/6/130620512/karepobunomeje.pdfIn PDF document text
    • http://mywoodshop.co/uploads/1/3/0/6/130622038/bobemenotixapo.pdfIn PDF document text
    • http://gettsphotos.com/uploads/1/3/0/4/130492038/fefufezok-vufunu.pdfIn PDF document text
    • http://michiganautoinjurylaw.com/uploads/1/3/0/5/130538918/zisota.pdfIn PDF document text
    • http://zombiecloths.com/uploads/1/3/0/4/130435661/vepunusafab-zumexiwa.pdfIn PDF document text
    • http://msplantdiv4.com/uploads/1/3/0/6/130639803/1c04ce9e2a4ecb.pdfIn PDF document text
    • http://repoqueen.com/uploads/1/3/0/2/130289653/9121254.pdfIn PDF document text
    • http://worldpoetryopenmic.org/uploads/1/3/1/1/131163949/4630688.pdfIn PDF document text
    • http://bldent.ca/uploads/1/3/1/4/131453753/605dc2.pdfIn PDF document text
    • http://hallenbeckpublishing.com/uploads/1/3/1/3/131384015/ravodomi.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://www.adobe.com/).NotoIn PDF document text
    • http://www.google.com/get/noto/http://www.adobe.com/type/ThisIn PDF document text
    • http://scripts.sil.org/OFLNotoIn PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 2

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

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9500 6836 bytes
SHA-256: 08a5200c724824171a1ca6c072aa5ff2681cf26af651cf1e3b97d8563209df2d
font_01_sfnt_off0000a5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5F9 9884 bytes
SHA-256: 0226d8426882131f56e08cb7caa15895bbfaf028d05297654d3a123643014549
font_02_sfnt_off0000c6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D0 59628 bytes
SHA-256: a2b0b1c59f485623720205ca4009a9f5c10b3ef8fb149c49eb1b7423487ab673
font_03_sfnt_off00017ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AC2 2600 bytes
SHA-256: 8b49b898eeeb55350302230a0aef0e3fe581ebebceebb0d2663ff9d210fc83c8
font_04_sfnt_off000183db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183DB 21660 bytes
SHA-256: 8abc22e382cc99de06dea775234d46411e910da02098beadc76128f40057151a

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