Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f7837f0fcc2d36…

MALICIOUS

PDF

87.1 KB Created: 2020-04-14 03:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: edacf7c323542c2d99d708d3f277927e SHA-1: f9044b45795ca45766d8d6cb1286a70c4ae6da3f SHA-256: 17f7837f0fcc2d36ce63108f0c4331e4ce9c1e829c5b53126b96e7491628c56b
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous links suggests a potential for redirecting users to malicious sites or for SEO spamming. The document body itself appears to be corrupted or obfuscated, making it difficult to ascertain a specific lure.

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://suvivendelin.com/uploads/1/3/0/7/130776415/130776415.html#loi+binomiale+formule
    • http://cypress-it.com/uploads/1/3/0/7/130775432/3593a68b54ca0b.pdf
    • http://harderbrothers.info/uploads/1/3/0/6/130604500/8840790.pdf
    • http://valleybikecommute.com/uploads/1/3/0/4/130483393/fifaxupisa-zamejodazegujot-loxawezaw-jepirorep.pdf
    • http://activatinggraphics.org/uploads/1/3/0/2/130287229/4089146.pdf
    • http://danarideoutpace.com/uploads/1/3/0/5/130588940/f9ecf60.pdf
    • http://sheapetsitting.com/uploads/1/3/1/0/131070247/jotipesikerim.pdf
    • http://cybersocialtexas.solutions/uploads/1/3/0/5/130590588/2023516.pdf
    • http://midwest-grow.com/uploads/1/3/1/4/131438323/30c62f9f194899.pdf
    • http://thebiryanibox.net/uploads/1/3/0/5/130546196/5423220.pdf
    • http://angelhomecollection.net/uploads/1/3/0/6/130639840/vakomudipa.pdf
    • http://bta4biz.com/uploads/1/3/0/9/130969764/puwirupi-pomurejedemijom-nepedu-wixunuvelepu.pdf
    • http://darciestevenson.com/uploads/1/3/0/4/130489222/wowuledifud_rezon_kanuzunekubif_kefilotobilu.pdf
    • http://magicdragonkauai.com/uploads/1/3/1/0/131070710/7907798.pdf
    • http://txfedblueseed.com/uploads/1/3/0/8/130814749/mivatamuveripovurow.pdf
    • http://ninediamondhomebusiness.com/uploads/1/3/0/5/130539886/zipawevekir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc5d.bin
232af715d73263bca61d60e52ec32aeb338243050fa19e39cee8fb2a3d4e46e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5D 11672 bytes
font_01_sfnt_off0001249f.bin
42ec21f557a8374bcb252c1cba4c3c0cbee0fe556d1c3258d8e0859d5f99d863		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1249F 5100 bytes
font_02_sfnt_off000135ea.bin
ca7182b981358d836cf0ffd85f4152ac397b843c0d6fc98b0cffaa2ca131dd61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135EA 16796 bytes

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