Malicious PDF — malware analysis report

Static analysis result for SHA-256 26533f4ad4192b85…

MALICIOUS

PDF

37.7 KB Created: 2020-03-27 08:47:50 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1b3162e430d47700ff1fa1432f16460f SHA-1: 7e477cd9dd7c052720dc85bdcb45ba88c5676f22 SHA-256: 26533f4ad4192b85514c224519519fb646a8b90e1d594472425c704935b198b9
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique commonly used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness. The document body itself is largely unreadable binary data, but the presence of numerous external URLs points to a link farm or distribution mechanism.

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://stormywaterscoaching.org/uploads/1/3/1/0/131069887/131069887.html#el+codigo+de+manu+resumen
    • http://untangledtahoe.com/uploads/1/3/0/2/130271076/8fe2c6f119fc.pdf
    • http://coltsound.com/uploads/1/3/0/4/130483408/5809616.pdf
    • http://www.chiromasterplan.com/uploads/1/3/0/4/130488410/sevexizif.pdf
    • http://www.nervousystem.net/uploads/1/3/0/4/130489253/pozufidif.pdf
    • http://tourdecroghan.com/uploads/1/3/0/8/130874157/65602f9efc7b5c.pdf
    • http://i-groupmarket.com/uploads/1/3/0/7/130776043/jasemuruzuzunitotev.pdf
    • http://rohrsenfitness.com/uploads/1/3/0/4/130476581/96e040b46d4f843.pdf
    • http://elevateyourdata.com/uploads/1/3/0/3/130323164/sotukefarujor_gutofe_jolab_jibunak.pdf
    • http://bridgemanagementservicesllc.com/uploads/1/3/0/7/130739038/c05d98ce51.pdf
    • http://www.ardor-innovations.com/uploads/1/3/0/8/130873861/firaforobozuzas.pdf
    • http://gracechurchandfamily.com/uploads/1/3/0/6/130639782/bovajaji-penubu.pdf
    • http://sparkleandsassonilne.com/uploads/1/3/0/9/130969474/6133746.pdf
    • http://431775997417950473.com/uploads/1/3/0/8/130874567/96f801.pdf
    • http://monicamontefusco78.com/uploads/1/3/0/7/130775529/2094982.pdf
    • http://lumaday.com/uploads/1/3/0/8/130874473/9b6fd35.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006aa5.bin
538e300f31b12daebb335c8156ade5fc4b798a4372498a61f084356f9fa710c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA5 8208 bytes

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